MATLAB简单程序大全
matlab经典源程序带有注释(详细经典)
2.1set 与get 函数 (1)2.2callback函数 (2)2.3元胞数组 (4)2.4结构数组 (6)2.5矩阵操作 (9)2.6字符串操作 (13)2.7判断函数使用大全 (16)2.11打开外部程序 (21)2.11程序运行时间 (22)2.14动画 (23)2.12动画 (24)2.23显示多行内容 (26)2.24 uitable 使用 (26)2.27鼠标操作 (27)2.28键盘操作 (27)2.32粘贴板 (28)2.1set 与get 函数set(edit_handle,'String','my value!'); %String为Edit控件的属性%%%2.1-1%创建figure对象hfig=figure(1);%创建坐标轴对象，指定其父对象为figure 1haxes1=axes('parent',hfig);prop.Color='b';prop.FontSize=12;set(haxes1,prop);%%%2.1-2hfig=figure(1);%查询其Units属性值get(hfig,'units')%其Units属性值为pixels（像素）% ans=% pixels%%%2.1-3%figure的Pointer属性标识了鼠标指针的形状set(gcf,'pointer');% 返回值为：[ crosshair | fullcrosshair | {arrow} | ibeam | watch | topl | topr | botl | botr | left | top | right | bottom | circle | cross | fleur | custom | hand ]%%%2.1-4%首先取得标识电脑屏幕大小的度量单位get(0,'units')% ans =% pixels%取得屏幕的尺寸get(0,'screensize')% ans =% 1 1 1280 8002.2callback函数%定义M文件的主函数名称为DefineCallback，不带输入和输出参数function DefineCallbackhFig= figure('units','normalize',...'position',[0.4 0.4 0.3 0.2]);%在窗口中创建按钮控件，并定义其Callback属性uicontrol('parent',hFig,...'style','pushbutton',...'String','Execute Callback',...'units','normalize',...'position',[0.4 0.4 0.3 0.2],...'callback',['figure;',...'x = 0:pi/20:2*pi;',...'y = sin(x);',...'plot(x,y);']);%定义M文件的主函数名称为DefineCallback，不带输入和输出参数function DefineCallback%创建界面窗口hFig= figure('units','normalize',...'position',[0.4 0.4 0.3 0.2]);%在窗口中创建按钮控件hpush=uicontrol('parent',hFig,...'style','pushbutton',...'String','Execute Callback',...'units','normalize',...'position',[0.4 0.4 0.3 0.2]);%设置按钮的Callback属性set(hpush,'callback',@mycallback);%定义回调函数为子函数function mycallback(hobj,event)figure;x = 0:pi/20:2*pi;y = sin(x);plot(x,y);2.3元胞数组a={'hello' [1 2 3;4 5 6];1 {'1''2'}}a ='hello' [2x3 double][ 1] {1x2 cell }%示例2：将元胞数组a中的元胞逐一赋值>> a{1,1}='hello';a{1,2}=[1 2 3;4 5 6];a{2,1}=1;a{2,2}={'1' '2'};>> aa ='hello' [2x3 double][ 1] {1x2 cell }%示例3：使用cell函数来创建元胞数组%生成2x3的元素为空数组的元胞数组>> a=cell(2,3)a =[] [] [][] [] []%示例4：判断数组A是否为元胞数组%定义一个元胞数组A>> A={1 2 3};%判断A是否为元胞数组，如果为元胞数组，则函数>> tf = iscell(A)tf =1%示例5：显示元胞数组C中的内容>> clear>> C={'Smith' [1 2;3 4] [12]};%直接显示元胞数组C中的内容>> celldisp(C)C{1} =SmithC{2} =1 23 4C{3} =12%显示元胞数组C中的内容，数组的名称用cellcontent代替>> celldisp(C,'cellcontent')cellcontent{1} =Smithcellcontent{2} =1 23 4cellcontent{3} =12%示例6：将字符数组转换为元胞数组>> S = ['abc '; 'defg'; 'hi m'];>> cellstr(S)ans ='abc'%原先abc后面的空格被清除'defg''hi m'%i和m之间的空格仍然保留%示例7：显示元胞数组S中的内容（包括空格和字符）>> S = {'abc ', 'defg','hi m'};>> cellplot(S)%示例8：将数字数组A按行或按列转换为元胞数组%A是4x3的数组>> A=[1 2 3;4 5 6;7 8 9;10 11 12];%把A的每一列转换为一个元胞，得到的C是1×3的元胞数组>> C=num2cell(A,1)C =[4x1 double] [4x1 double] [4x1 double] %把A的每一行转换为一个元胞，得到的C是4×1的元胞数组>> C=num2cell(A,2)C =[1x3 double][1x3 double][1x3 double][1x3 double]2.4结构数组%示例1：使用直接法来创建结构数组>> A(1).name = 'Pat';A(1).number = 176554;A(2).name = 'Tony';A(2).number = 901325;>> AA =1x2 struct array with fields:namenumber%示例2：利用struct函数来创建结构数组>> A(1)=struct('name','Pat','number',176554);A(2)=struct('name','Tony','number',901325);>> AA =1x2 struct array with fields:namenumber%示例3：使用deal函数来得到结构体中各结构域的值%定义结构数组A>> = 'Pat'; A.number = 176554;A(2).name = 'Tony';A(2).number = 901325;%得到结构数组中所有name结构域的数据>>[name1,name2] = deal(A(:).name)name1 =Patname2 =Tony%示例4：使用getfield函数来取得结构体中结构域的值%定义mystr结构数组>> mystr(1,1).name = 'alice';mystr(1,1).ID = 0;mystr(2,1).name = 'gertrude';mystr(2,1).ID = 1;%取得mystr(2,1)的结构域name的值>> f = getfield(mystr, {2,1}, 'name')f =gertrude%示例5：删除结构数组中的指定结构域%定义结构数组s>> s.field1=[1 2 3];s.field2='string';s.field3={1 2 3;4 5 6}; %删除结构域field1>> s=rmfield(s,'field1')s =field2: 'string'field3: {2x3 cell}%删除结构域'field2','field3'>> s=rmfield(s,{'field2','field3'})s =field1: [1 2 3]%示例6：%定义结构数组s>> s.field1=[1 2 3];s.field2='string';s.field3={1 2 3;4 5 6}; >> ss =field1: [1 2 3]field2: 'string'field3: {2x3 cell}%将结构数组转换为元胞数组>> c=struct2cell(s)c =[1x3 double]'string'{2x3 cell }%示例7：>>c = {'birch', 'betula', 65; 'maple', 'acer', 50}c ='birch''betula' [65]'maple''acer' [50]>>fields = {'name', 'genus', 'height'}; %fields包含struct中的结构域名>>s = cell2struct(c, fields, 2); %dim=2表示把c中的各行转换为struct数组s =2x1 struct array with fields:namegenusheight>> s(1)ans =name: 'birch'genus: 'betula'height: 65>> s(2)ans =name: 'maple'genus: 'acer'height: 50>> fields = {'field1', 'field2'};>> s = cell2struct(c, fields, 1); %dim=1表示把c中的各列转换为struct数组>> s(1)ans =field1: 'birch'field2: 'maple'>> s(2)ans =field1: 'betula'field2: 'acer'>> s(3)ans =field1:65field2:502.5矩阵操作%示例1： find函数的使用方法。
matlab程序
matlab程序（1）0122sin851z e =+ Z=(2*sin(85/180)*pi)/(1+exp(2))(2)22121(0.4552i z In x x +??=+=??-??其中x=[2,1+2i;-0.45,5]; Z=(1/2)*log(x+sqrt(1+(x*x)))(3) 已知 1234413134787,2033657327A B --==-????求下列表达式的值：A+6*B A=[12,34,-4;34,7,87;3,65,7]B=[1,3,-1;2,0,3;3,-2,7]Z=A+6*BA-B+I （其中I 为单位矩阵）U=A-B+eyeA*B D=A*BA^3 F=A^3A.^3 Z=A.^3A/B Z=A/BB\A Z=B/A[A,B] Z=[A,B][A （[1，3]，：）；B^2] Z=[A([1,3],:);B^2](4)设有矩阵A 和B1234530166789101769A ,111213141502341617181920970212223242541311B -==-求它们的乘积 A=[1,2,3,4,5;6,7,8,9,10;11,12,13,14,15;16,17,18,19,20;21,22,23,24,25]B=[3,0,16;17,-6,9;0,23,-4;9,7,0;4,13,11]C=A*B 将矩阵C 的右下⾓3*2⼦矩阵赋给D ；D=C([3,4,5],[2,3])(5)⽤for 循环语句实现求1～100的和 sum=0;for x=1:100 sum=sum+x;end(6) ⽤for 循环语句求10！n=10;y=1;for i=1:1:n;y=y*i;end(7) 分别⽤if 和switch 语句实现以下计算，a,b,c,x 的值从键盘输⼊：<≤<≤<≤++++=5.55.35.35.15.15.0,/,sin ,2x x x x c b In x b a c bx ax y c a=input('a=?') b=input('b=?') c=input('c=?') x=input('x=?') if(0.5<=x)&(x<1.5) y=a*x*x+b*x+celseif(1.5<=x)&(x<3.5) y=a*(sinb).^c+xelseif(3.5<=x)&(x<5.5) y=log(abs((b+c/x))) enda=input('a=?') b=input('b=?') c=input('c=?') x=input('x=?')switch xcase (0.5<=x)&(x<1.5) y=a*x*x+b*x+ccase (1.5<=x)&(x<3.5) y=a*(sinb).^c+xcase (3.5<=x)&(x<5.5) y=log(abs((b+c/x)))end(8)⽤图形表⽰连续调制波形Y=sin(t )sin(9t ) 及其包络线。
matlab_简明实例教程
matlab_简明实例教程MATLAB是一种强大的科学计算工具，广泛应用于科学研究、数据分析和工程计算等领域。
它具有简单易用的语法和丰富的函数库，可以快速实现复杂的计算任务。
本教程将为你提供一些简单实例，帮助你入门MATLAB。
1.计算圆的面积和周长```matlabradius = input('请输入圆的半径：');area = pi * radius^2;circumference = 2 * pi * radius;disp(['圆的面积为：', num2str(area)]);disp(['圆的周长为：', num2str(circumference)]);```2.计算两个向量的点积```matlabv1 = input('请输入向量1（用逗号分隔元素）：');v2 = input('请输入向量2（用逗号分隔元素）：');dot_product = dot(v1, v2);disp(['两个向量的点积为：', num2str(dot_product)]);```3.绘制正弦曲线```matlabx = 0:0.1:2*pi;y = sin(x);plot(x, y);xlabel('x');ylabel('sin(x)');title('正弦曲线');```4.求解方程```matlabsyms x;eqn = x^2 - 4 == 0;sol = solve(eqn, x);disp(['方程的解为：', char(sol)]); ```5.读取和写入文件```matlabfilename = 'data.txt';data = importdata(filename);disp('文件中的数据：');disp(data);output = [1 2 3; 4 5 6; 7 8 9];dlmwrite('result.txt', output, 'delimiter', '\t', 'precision', 4);disp('结果已保存到result.txt文件中。
matlab简单编程21个题目及答案
1、设⎥⎦⎤⎢⎣⎡++=)1(sin35.0cos2xxxy，把x=0~2π间分为101点，画出以x为横坐标，y为纵坐标的曲线。
第一题的matlab源程序：①考虑cos（x）为一个整体，然后乘以中括号里面的全部x=0:2*pi/100:2*pi; %x的步长以及范围从0到2*pi y=cos(x).*(0.5+3*sin(x)./(1+x.^2)); %y的表达式plot(x,y)%画出图形图如下：②考虑对整体求解cos，先求x乘以括号中的部分x=0:2*pi/100:2*pi; %x的步长以及范围从0到2*pi y=cos(x.*(0.5+3*sin(x)./(1+x.^2))); %y的表达式plot(x,y) %画出图形图如下：2、产生8×6阶的正态分布随机数矩阵R1, 求其各列的平均值和均方差。
并求该矩阵全体数的平均值和均方差。
第二题的matlab源程序如下：R1=randn(8,6) %产生正态分布随机矩阵R1 =1.0933 -0.7697 1.5442 -0.1924 1.4193 0.21571.1093 0.3714 0.0859 0.8886 0.2916 -1.1658-0.8637 -0.2256 -1.4916 -0.7648 0.1978 -1.14800.0774 1.1174 -0.7423 -1.4023 1.5877 0.1049-1.2141 -1.0891 -1.0616 -1.4224 -0.8045 0.7223-1.1135 0.0326 2.3505 0.4882 0.6966 2.5855-0.0068 0.5525 -0.6156 -0.1774 0.8351 -0.66691.5326 1.1006 0.7481 -0.1961 -0.2437 0.1873aver=(sum(R1(1:end,1:end)))./8 %产生各行的平均值aver =0.0768 0.1363 0.1022 -0.3473 0.4975 0.1044a=std(R1(1:end,1:end)) %产生各行的均方差也就是标准差a =1.0819 0.8093 1.3456 0.8233 0.8079 1.2150aver1=(sum(R1(:)))./48 %全体数的平均值aver1 =0.0950b=std(R1(:)) %全体数的均方差即标准差b =1.01033、设x=rcost+3t,y=rsint+3,分别令r=2,3,4，画出参数t=0~10区间生成的x~y 曲线。
MATLAB操作命令大全
MATLAB操作命令大全1.基本操作：- clear: 清除工作区中的所有变量。
- clc: 清除命令窗口的内容。
- close all: 关闭所有图形窗口。
- help function-name: 显示与函数相关的帮助文档。
- who: 显示当前工作区中的所有变量。
- save file-name: 保存当前工作区中的所有变量到指定的文件。
- load file-name: 从文件中加载变量到当前工作区。
2.变量操作：-=:赋值操作符，将右边的值赋给左边的变量。
-+:加法操作符。
--:减法操作符。
-*:乘法操作符。
-/:除法操作符。
-^:幂运算操作符。
- sqrt(x): 计算 x 的平方根。
- abs(x): 计算 x 的绝对值。
- max(x): 返回 x 中的最大值。
- min(x): 返回 x 中的最小值。
- sum(x): 计算 x 中所有元素的和。
3.数组操作：- zeros(m, n): 创建一个 m 行 n 列的全零数组。
- ones(m, n): 创建一个 m 行 n 列的全一数组。
- eye(n): 创建一个 n 行 n 列的单位矩阵。
- size(x): 返回 x 的维度。
- length(x): 返回 x 的长度。
- reshape(x, m, n): 将 x 重新排列为一个 m 行 n 列矩阵。
- transpose(x): 将 x 的行和列互换。
4.控制流程：- if-else: 条件语句，根据条件执行不同的代码块。
- for loop: 循环语句，执行指定次数的代码块。
- while loop: 循环语句，根据条件反复执行代码块。
- break: 在循环中使用，用来跳出当前循环。
- continue: 在循环中使用，用来跳过当前循环的剩余部分。
5.统计分析：- mean(x): 计算 x 的平均值。
- median(x): 计算 x 的中位数。
- std(x): 计算 x 的标准差。
matlab编程实例100例(精编文档).doc
【最新整理，下载后即可编辑】1-32是：图形应用篇33-66是：界面设计篇67-84是：图形处理篇85-100是：数值分析篇实例1：三角函数曲线（1）function shili01h0=figure('toolbar','none',...'position',[198****0300],...'name','实例01');h1=axes('parent',h0,...'visible','off');x=-pi:0.05:pi;y=sin(x);plot(x,y);xlabel('自变量X');ylabel('函数值Y');title('SIN( )函数曲线');grid on实例2：三角函数曲线（2）function shili02h0=figure('toolbar','none',...'position',[200 150 450 350],...'name','实例02');x=-pi:0.05:pi;y=sin(x)+cos(x);plot(x,y,'-*r','linewidth',1);grid onxlabel('自变量X');ylabel('函数值Y');title('三角函数');实例3：图形的叠加function shili03h0=figure('toolbar','none',...'position',[200 150 450 350],...'name','实例03');x=-pi:0.05:pi;y1=sin(x);y2=cos(x);plot(x,y1,...'-*r',...x,y2,...'--og');grid onxlabel('自变量X');ylabel('函数值Y');title('三角函数');实例4：双y轴图形的绘制function shili04h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例04');x=0:900;a=1000;b=0.005;y1=2*x;y2=cos(b*x);[haxes,hline1,hline2]=plotyy(x,y1,x,y2,'semilogy','plot'); axes(haxes(1))ylabel('semilog plot');axes(haxes(2))ylabel('linear plot');实例5：单个轴窗口显示多个图形function shili05h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例05');t=0:pi/10:2*pi;[x,y]=meshgrid(t);subplot(2,2,1)plot(sin(t),cos(t))axis equalsubplot(2,2,2)z=sin(x)-cos(y);plot(t,z)axis([0 2*pi -2 2])subplot(2,2,3)h=sin(x)+cos(y);plot(t,h)axis([0 2*pi -2 2])subplot(2,2,4)g=(sin(x).^2)-(cos(y).^2);plot(t,g)axis([0 2*pi -1 1])实例6：图形标注function shili06h0=figure('toolbar','none',...'position',[200 150 450 400],...'name','实例06');t=0:pi/10:2*pi;h=plot(t,sin(t));xlabel('t=0到2\pi','fontsize',16);ylabel('sin(t)','fontsize',16);title('\it{从0to2\pi 的正弦曲线}','fontsize',16) x=get(h,'xdata');y=get(h,'ydata');imin=find(min(y)==y);imax=find(max(y)==y);text(x(imin),y(imin),...['\leftarrow最小值=',num2str(y(imin))],...'fontsize',16)text(x(imax),y(imax),...['\leftarrow最大值=',num2str(y(imax))],...'fontsize',16)实例7：条形图形function shili07h0=figure('toolbar','none',...'position',[200 150 450 350],...'name','实例07');tiao1=[562 548 224 545 41 445 745 512];tiao2=[47 48 57 58 54 52 65 48];t=0:7;bar(t,tiao1)xlabel('X轴');ylabel('TIAO1值');h1=gca;h2=axes('position',get(h1,'position'));plot(t,tiao2,'linewidth',3)set(h2,'yaxislocation','right','color','none','xticklabel',[]) 实例8：区域图形function shili08h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例08');x=91:95;profits1=[88 75 84 93 77];profits2=[51 64 54 56 68];profits3=[42 54 34 25 24];profits4=[26 38 18 15 4];area(x,profits1,'facecolor',[0.5 0.9 0.6],...'edgecolor','b',...'linewidth',3)hold onarea(x,profits2,'facecolor',[0.9 0.85 0.7],...'edgecolor','y',...'linewidth',3)hold onarea(x,profits3,'facecolor',[0.3 0.6 0.7],...'edgecolor','r',...'linewidth',3)hold onarea(x,profits4,'facecolor',[0.6 0.5 0.9],...'edgecolor','m',...'linewidth',3)hold offset(gca,'xtick',[91:95])set(gca,'layer','top')gtext('\leftarrow第一季度销量') gtext('\leftarrow第二季度销量') gtext('\leftarrow第三季度销量') gtext('\leftarrow第四季度销量') xlabel('年','fontsize',16);ylabel('销售量','fontsize',16);实例9：饼图的绘制function shili09h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例09');t=[54 21 35;68 54 35;45 25 12;48 68 45;68 54 69];x=sum(t);h=pie(x);textobjs=findobj(h,'type','text');str1=get(textobjs,{'string'});val1=get(textobjs,{'extent'});oldext=cat(1,val1{:});names={'商品一：';'商品二：';'商品三：'};str2=strcat(names,str1);set(textobjs,{'string'},str2)val2=get(textobjs,{'extent'});newext=cat(1,val2{:});offset=sign(oldext(:,1)).*(newext(:,3)-oldext(:,3))/2; pos=get(textobjs,{'position'});textpos=cat(1,pos{:});textpos(:,1)=textpos(:,1)+offset;set(textobjs,{'position'},num2cell(textpos,[3,2]))实例10：阶梯图function shili10h0=figure('toolbar','none',...'position',[200 150 450 400],...'name','实例10');a=0.01;b=0.5;t=0:10;f=exp(-a*t).*sin(b*t);stairs(t,f)hold onplot(t,f,':*')hold offglabel='函数e^{-(\alpha*t)}sin\beta*t的阶梯图'; gtext(glabel,'fontsize',16)xlabel('t=0:10','fontsize',16)axis([0 10 -1.2 1.2])实例11：枝干图function shili11h0=figure('toolbar','none',...'position',[200 150 450 350],...'name','实例11');x=0:pi/20:2*pi;y1=sin(x);y2=cos(x);h1=stem(x,y1+y2);hold onh2=plot(x,y1,'^r',x,y2,'*g');hold offh3=[h1(1);h2];legend(h3,'y1+y2','y1=sin(x)','y2=cos(x)') xlabel('自变量X');ylabel('函数值Y');title('正弦函数与余弦函数的线性组合'); 实例12：罗盘图function shili12h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例12');winddirection=[54 24 65 84256 12 235 62125 324 34 254];windpower=[2 5 5 36 8 12 76 14 10 8];rdirection=winddirection*pi/180;[x,y]=pol2cart(rdirection,windpower); compass(x,y);desc={'风向和风力','北京气象台','10月1日0：00到','10月1日12：00'};gtext(desc)实例13：轮廓图function shili13h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例13');[th,r]=meshgrid((0:10:360)*pi/180,0:0.05:1); [x,y]=pol2cart(th,r);z=x+i*y;f=(z.^4-1).^(0.25);contour(x,y,abs(f),20)axis equalxlabel('实部','fontsize',16);ylabel('虚部','fontsize',16);h=polar([0 2*pi],[0 1]);delete(h)hold oncontour(x,y,abs(f),20)实例14：交互式图形function shili14h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例14');axis([0 10 0 10]);hold onx=[];y=[];n=0;disp('单击鼠标左键点取需要的点'); disp('单击鼠标右键点取最后一个点'); but=1;while but==1[xi,yi,but]=ginput(1);plot(xi,yi,'bo')n=n+1;disp('单击鼠标左键点取下一个点');x(n,1)=xi;y(n,1)=yi;endt=1:n;ts=1:0.1:n;xs=spline(t,x,ts);ys=spline(t,y,ts);plot(xs,ys,'r-');hold off实例14：交互式图形function shili14h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例14');axis([0 10 0 10]);hold onx=[];y=[];n=0;disp('单击鼠标左键点取需要的点'); disp('单击鼠标右键点取最后一个点'); but=1;while but==1[xi,yi,but]=ginput(1);plot(xi,yi,'bo')n=n+1;disp('单击鼠标左键点取下一个点');x(n,1)=xi;y(n,1)=yi;endt=1:n;ts=1:0.1:n;xs=spline(t,x,ts);ys=spline(t,y,ts);plot(xs,ys,'r-');hold off实例15：变换的傅立叶函数曲线function shili15h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例15');axis equalm=moviein(20,gcf);set(gca,'nextplot','replacechildren')h=uicontrol('style','slider','position',...[100 10 500 20],'min',1,'max',20)for j=1:20plot(fft(eye(j+16)))set(h,'value',j)m(:,j)=getframe(gcf);endclf;axes('position',[0 0 1 1]);movie(m,30)实例16：劳伦兹非线形方程的无序活动function shili15h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例15');axis equalm=moviein(20,gcf);set(gca,'nextplot','replacechildren')h=uicontrol('style','slider','position',...[100 10 500 20],'min',1,'max',20)for j=1:20plot(fft(eye(j+16)))set(h,'value',j)m(:,j)=getframe(gcf);endclf;axes('position',[0 0 1 1]);movie(m,30)实例17：填充图function shili17h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例17');t=(1:2:15)*pi/8;x=sin(t);y=cos(t);fill(x,y,'r')axis square offtext(0,0,'STOP',...'color',[1 1 1],...'fontsize',50,...'horizontalalignment','center') 例18：条形图和阶梯形图function shili18h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例18');subplot(2,2,1)x=-3:0.2:3;y=exp(-x.*x);bar(x,y)title('2-D Bar Chart')subplot(2,2,2)x=-3:0.2:3;y=exp(-x.*x);bar3(x,y,'r')title('3-D Bar Chart')subplot(2,2,3)x=-3:0.2:3;y=exp(-x.*x);stairs(x,y)title('Stair Chart')subplot(2,2,4)x=-3:0.2:3;y=exp(-x.*x);barh(x,y)title('Horizontal Bar Chart')实例19：三维曲线图function shili19h0=figure('toolbar','none',...'position',[200 150 450 400],...'name','实例19');subplot(2,1,1)x=linspace(0,2*pi);y1=sin(x);y2=cos(x);y3=sin(x)+cos(x);z1=zeros(size(x));z2=0.5*z1;z3=z1;plot3(x,y1,z1,x,y2,z2,x,y3,z3)grid onxlabel('X轴');ylabel('Y轴');zlabel('Z轴');title('Figure1:3-D Plot')subplot(2,1,2)x=linspace(0,2*pi);y1=sin(x);y2=cos(x);y3=sin(x)+cos(x);z1=zeros(size(x));z2=0.5*z1;z3=z1;plot3(x,z1,y1,x,z2,y2,x,z3,y3)grid onxlabel('X轴');ylabel('Y轴');zlabel('Z轴');title('Figure2:3-D Plot')实例20：图形的隐藏属性function shili20h0=figure('toolbar','none',...'position',[200 150 450 300],...'name','实例20');subplot(1,2,1)[x,y,z]=sphere(10);mesh(x,y,z)axis offtitle('Figure1:Opaque')hidden onsubplot(1,2,2)[x,y,z]=sphere(10);mesh(x,y,z)axis offtitle('Figure2:Transparent') hidden off实例21PEAKS函数曲线function shili21h0=figure('toolbar','none',...'position',[200 100 450 450],...'name','实例21');[x,y,z]=peaks(30);subplot(2,1,1)x=x(1,:);y=y(:,1);i=find(y>0.8&y<1.2);j=find(x>-0.6&x<0.5);z(i,j)=nan*z(i,j);surfc(x,y,z)xlabel('X轴');ylabel('Y轴');zlabel('Z轴');title('Figure1:surfc函数形成的曲面') subplot(2,1,2)x=x(1,:);y=y(:,1);i=find(y>0.8&y<1.2);j=find(x>-0.6&x<0.5);z(i,j)=nan*z(i,j);surfl(x,y,z)xlabel('X轴');ylabel('Y轴');zlabel('Z轴');title('Figure2:surfl函数形成的曲面') 实例22：片状图function shili22h0=figure('toolbar','none',...'position',[200 150 550 350],...'name','实例22');subplot(1,2,1)x=rand(1,20);y=rand(1,20);z=peaks(x,y*pi);t=delaunay(x,y);trimesh(t,x,y,z)hidden offtitle('Figure1:Triangular Surface Plot'); subplot(1,2,2)x=rand(1,20);y=rand(1,20);z=peaks(x,y*pi);t=delaunay(x,y);trisurf(t,x,y,z)title('Figure1:Triangular Surface Plot'); 实例23：视角的调整function shili23h0=figure('toolbar','none',...'position',[200 150 450 350],...'name','实例23');x=-5:0.5:5;[x,y]=meshgrid(x);r=sqrt(x.^2+y.^2)+eps;z=sin(r)./r;subplot(2,2,1)surf(x,y,z)xlabel('X-axis')ylabel('Y-axis')zlabel('Z-axis')title('Figure1')view(-37.5,30)subplot(2,2,2)surf(x,y,z)xlabel('X-axis')ylabel('Y-axis')zlabel('Z-axis')title('Figure2')view(-37.5+90,30) subplot(2,2,3)surf(x,y,z)xlabel('X-axis')ylabel('Y-axis')zlabel('Z-axis')title('Figure3')view(-37.5,60)subplot(2,2,4)surf(x,y,z)xlabel('X-axis')ylabel('Y-axis')zlabel('Z-axis')title('Figure4')view(180,0)实例24：向量场的绘制function shili24h0=figure('toolbar','none',...'position',[200 150 450 350],...'name','实例24');subplot(2,2,1)z=peaks;ribbon(z)title('Figure1')subplot(2,2,2)[x,y,z]=peaks(15);[dx,dy]=gradient(z,0.5,0.5); contour(x,y,z,10)hold onquiver(x,y,dx,dy)hold offtitle('Figure2')subplot(2,2,3)[x,y,z]=peaks(15);[nx,ny,nz]=surfnorm(x,y,z);surf(x,y,z)hold onquiver3(x,y,z,nx,ny,nz)hold offtitle('Figure3')subplot(2,2,4)x=rand(3,5);y=rand(3,5);z=rand(3,5);c=rand(3,5);fill3(x,y,z,c)grid ontitle('Figure4')实例25：灯光定位function shili25h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例25');vert=[1 1 1;1 2 1;2 2 1;2 1 1;1 1 2;12 2;2 2 2;2 1 2];fac=[1 2 3 4;2 6 7 3;4 3 7 8;15 8 4;1 2 6 5;5 6 7 8];grid offsphere(36)h=findobj('type','surface');set(h,'facelighting','phong',...'facecolor',...'interp',...'edgecolor',[0.4 0.4 0.4],...'backfacelighting',...'lit')hold onpatch('faces',fac,'vertices',vert,...'facecolor','y');light('position',[1 3 2]);light('position',[-3 -1 3]);material shinyaxis vis3d offhold off实例26：柱状图function shili26h0=figure('toolbar','none',...'position',[200 50 450 450],...'name','实例26'); subplot(2,1,1)x=[5 2 18 7 39 8 65 5 54 3 2];bar(x)xlabel('X轴');ylabel('Y轴');title('第一子图');subplot(2,1,2)y=[5 2 18 7 39 8 65 5 54 3 2];barh(y)xlabel('X轴');ylabel('Y轴');title('第二子图');实例27：设置照明方式function shili27h0=figure('toolbar','none',...'position',[200 150 450 350],...'name','实例27');subplot(2,2,1)sphereshading flatcamlight leftcamlight rightlighting flatcolorbaraxis offtitle('Figure1')subplot(2,2,2)sphereshading flatcamlight leftcamlight rightlighting gouraudcolorbaraxis offtitle('Figure2')subplot(2,2,3)sphereshading interpcamlight rightcamlight leftlighting phongaxis offtitle('Figure3')subplot(2,2,4)sphereshading flatcamlight leftcamlight rightlighting nonecolorbaraxis offtitle('Figure4')实例28：羽状图function shili28h0=figure('toolbar','none',...'position',[200 150 450 350],...'name','实例28');subplot(2,1,1)alpha=90:-10:0;r=ones(size(alpha));m=alpha*pi/180;n=r*10;[u,v]=pol2cart(m,n);feather(u,v)title('羽状图')axis([0 20 0 10])subplot(2,1,2)t=0:0.5:10;y=exp(-x*t);feather(y)title('复数矩阵的羽状图')实例29：立体透视（1）function shili29h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例29');[x,y,z]=meshgrid(-2:0.1:2,...-2:0.1:2,...-2:0.1:2);v=x.*exp(-x.^2-y.^2-z.^2);grid onfor i=-2:0.5:2;h1=surf(linspace(-2,2,20),...linspace(-2,2,20),...zeros(20)+i);rotate(h1,[1 -1 1],30)dx=get(h1,'xdata');dy=get(h1,'ydata');dz=get(h1,'zdata');delete(h1)slice(x,y,z,v,[-2 2],2,-2)hold onslice(x,y,z,v,dx,dy,dz)hold offaxis tightview(-5,10)drawnowend实例30：立体透视（2）function shili30h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例30');[x,y,z]=meshgrid(-2:0.1:2,...-2:0.1:2,...-2:0.1:2);v=x.*exp(-x.^2-y.^2-z.^2); [dx,dy,dz]=cylinder;slice(x,y,z,v,[-2 2],2,-2)for i=-2:0.2:2h=surface(dx+i,dy,dz);rotate(h,[1 0 0],90)xp=get(h,'xdata');yp=get(h,'ydata');zp=get(h,'zdata');delete(h)hold onhs=slice(x,y,z,v,xp,yp,zp);axis tightxlim([-3 3])view(-10,35)drawnowdelete(hs)hold offend实例31：表面图形function shili31h0=figure('toolbar','none',...'position',[200 150 550 250],...'name','实例31');subplot(1,2,1)x=rand(100,1)*16-8;y=rand(100,1)*16-8;r=sqrt(x.^2+y.^2)+eps;z=sin(r)./r;xlin=linspace(min(x),max(x),33); ylin=linspace(min(y),max(y),33); [X,Y]=meshgrid(xlin,ylin);Z=griddata(x,y,z,X,Y,'cubic'); mesh(X,Y,Z)axis tighthold onplot3(x,y,z,'.','Markersize',20) subplot(1,2,2)k=5;n=2^k-1;theta=pi*(-n:2:n)/n;phi=(pi/2)*(-n:2:n)'/n;X=cos(phi)*cos(theta);Y=cos(phi)*sin(theta);Z=sin(phi)*ones(size(theta)); colormap([0 0 0;1 1 1])C=hadamard(2^k);surf(X,Y,Z,C)axis square实例32：沿曲线移动的小球h0=figure('toolbar','none',...'position',[198****8468],...'name','实例32');h1=axes('parent',h0,...'position',[0.15 0.45 0.7 0.5],...'visible','on');t=0:pi/24:4*pi;y=sin(t);plot(t,y,'b')n=length(t);h=line('color',[0 0.5 0.5],...'linestyle','.',...'markersize',25,...'erasemode','xor');k1=uicontrol('parent',h0,...'style','pushbutton',...'position',[80 100 50 30],...'string','开始',...'callback',[...'i=1;',...'k=1;,',...'m=0;,',...'while 1,',...'if k==0,',...'break,',...'end,',...'if k~=0,',...'set(h,''xdata'',t(i),''ydata'',y(i)),',...'drawnow;,',...'i=i+1;,',...'if i>n,',...'m=m+1;,',...'i=1;,',...'end,',...'end,',...'end']);k2=uicontrol('parent',h0,...'style','pushbutton',...'position',[180 100 50 30],...'string','停止',...'callback',[...'k=0;,',...'set(e1,''string'',m),',...'p=get(h,''xdata'');,',...'q=get(h,''ydata'');,',...'set(e2,''string'',p);,',...'set(e3,''string'',q)']); k3=uicontrol('parent',h0,...'style','pushbutton',...'position',[280 100 50 30],...'string','关闭',...'callback','close');e1=uicontrol('parent',h0,...'style','edit',...'position',[60 30 60 20]);t1=uicontrol('parent',h0,...'style','text',...'string','循环次数',...'position',[60 50 60 20]);e2=uicontrol('parent',h0,...'style','edit',...'position',[180 30 50 20]);t2=uicontrol('parent',h0,...'style','text',...'string','终点的X坐标值',...'position',[155 50 100 20]);e3=uicontrol('parent',h0,...'style','edit',...'position',[300 30 50 20]);t3=uicontrol('parent',h0,...'style','text',...'string','终点的Y坐标值',...'position',[275 50 100 20]);实例33：曲线转换按钮h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例33');x=0:0.5:2*pi;y=sin(x);h=plot(x,y);grid onhuidiao=[...'if i==1,',...'i=0;,',...'y=cos(x);,',...'delete(h),',...'set(hm,''string'',''正弦函数''),',...'h=plot(x,y);,',...'grid on,',...'else if i==0,',...'i=1;,',...'y=sin(x);,',...'set(hm,''string'',''余弦函数''),',...'delete(h),',...'h=plot(x,y);,',...'grid on,',...'end,',...'end'];hm=uicontrol(gcf,'style','pushbutton',...'string','余弦函数',...'callback',huidiao);i=1;set(hm,'position',[250 20 60 20]);set(gca,'position',[0.2 0.2 0.6 0.6])title('按钮的使用')hold on实例34：栅格控制按钮h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例34');x=0:0.5:2*pi;y=sin(x);plot(x,y)huidiao1=[...'set(h_toggle2,''value'',0),',...'grid on,',...];huidiao2=[...'set(h_toggle1,''value'',0),',...'grid off,',...];h_toggle1=uicontrol(gcf,'style','togglebutton',...'string','grid on',...'value',0,...'position',[20 45 50 20],...'callback',huidiao1);h_toggle2=uicontrol(gcf,'style','togglebutton',...'string','grid off',...'value',0,...'position',[20 20 50 20],...'callback',huidiao2);set(gca,'position',[0.2 0.2 0.6 0.6])title('开关按钮的使用')实例35：编辑框的使用h0=figure('toolbar','none',...'position',[200 150 350 250],...'name','实例35');f='Please input the letter';huidiao1=[...'g=upper(f);,',...'set(h2_edit,''string'',g),',...];huidiao2=[...'g=lower(f);,',...'set(h2_edit,''string'',g),',...];h1_edit=uicontrol(gcf,'style','edit',...'position',[100 200 100 50],...'HorizontalAlignment','left',...'string','Please input the letter',...'callback','f=get(h1_edit,''string'');',...'background','w',...'max',5,...'min',1);h2_edit=uicontrol(gcf,'style','edit',...'HorizontalAlignment','left',...'position',[100 100 100 50],...'background','w',...'max',5,...'min',1);h1_button=uicontrol(gcf,'style','pushbutton',...'string','小写变大写',...'position',[100 45 100 20],...'callback',huidiao1);h2_button=uicontrol(gcf,'style','pushbutton',...'string','大写变小写',...'position',[100 20 100 20],...'callback',huidiao2);实例36：弹出式菜单h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例36');x=0:0.5:2*pi;y=sin(x);h=plot(x,y);grid onhm=uicontrol(gcf,'style','popupmenu',...'string',...'sin(x)|cos(x)|sin(x)+cos(x)|exp(-sin(x))',...'position',[250 20 50 20]);set(hm,'value',1)huidiao=[...'v=get(hm,''value'');,',...'switch v,',...'case 1,',...'delete(h),',...'y=sin(x);,',...'h=plot(x,y);,',...'grid on,',...'case 2,',...'delete(h),',...'y=cos(x);,',...'h=plot(x,y);,',...'grid on,',...'case 3,',...'delete(h),',...'y=sin(x)+cos(x);,',...'h=plot(x,y);,',...'grid on,',...'case 4,',...'delete(h),',...'y=exp(-sin(x));,',...'h=plot(x,y);,',...'grid on,',...'end'];set(hm,'callback',huidiao)set(gca,'position',[0.2 0.2 0.6 0.6]) title('弹出式菜单的使用')实例37：滑标的使用h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例37');[x,y]=meshgrid(-8:0.5:8);r=sqrt(x.^2+y.^2)+eps;z=sin(r)./r;h0=mesh(x,y,z);h1=axes('position',...[0.2 0.2 0.5 0.5],...'visible','off');htext=uicontrol(gcf,...'units','points',...'position',[20 30 45 15],...'string','brightness',...'style','text');hslider=uicontrol(gcf,...'units','points',...'position',[10 10 300 15],...'min',-1,...'max',1,...'style','slider',...'callback',...'brighten(get(hslider,''value''))'); 实例38：多选菜单h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例38');[x,y]=meshgrid(-8:0.5:8);r=sqrt(x.^2+y.^2)+eps;z=sin(r)./r;h0=mesh(x,y,z);hlist=uicontrol(gcf,'style','listbox',...'string','default|spring|summer|autumn|winter',...'max',5,...'min',1,...'position',[20 20 80 100],...'callback',[...'k=get(hlist,''value'');,',...'switch k,',...'case 1,',...'colormap default,',...'case 2,',...'colormap spring,',...'case 3,',...'colormap summer,',...'case 4,',...'colormap autumn,',...'case 5,',...'colormap winter,',...'end']);实例39：菜单控制的使用h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例39');x=0:0.5:2*pi;y=cos(x);h=plot(x,y);grid onset(gcf,'toolbar','none')hm=uimenu('label','example');huidiao1=[...'set(hm_gridon,''checked'',''on''),',...'set(hm_gridoff,''checked'',''off''),',...'grid on'];huidiao2=[...'set(hm_gridoff,''checked'',''on''),',...'set(hm_gridon,''checked'',''off''),',...'grid off'];hm_gridon=uimenu(hm,'label','grid on',...'checked','on',...'callback',huidiao1);hm_gridoff=uimenu(hm,'label','grid off',...'checked','off',...'callback',huidiao2);实例40：UIMENU菜单的应用h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例40');h1=uimenu(gcf,'label','函数');h11=uimenu(h1,'label','轮廓图',...'callback',[...'set(h31,''checked'',''on''),',...'set(h32,''checked'',''off''),',...'[x,y,z]=peaks;,',...'contour3(x,y,z,30)']);h12=uimenu(h1,'label','高斯分布',...'callback',[...'set(h31,''checked'',''on''),',...'set(h32,''checked'',''off''),',...'mesh(peaks);,',...'axis tight']);。
(完整word版)MatLab代码大全
第2章图像获取2.3.2 二维连续傅里叶变换例2.2figure(1); %建立图形窗口1[u,v] = meshgrid(-1:0.01:1); %生成二维频域网格F1 = abs(sinc(u.*pi));F2 = abs(sinc(v.*pi));F=F1.*F2; %计算幅度频谱F=|F(u,v)|surf(u,v,F); %显示幅度频谱，如图2.3(b)shading interp; %平滑三维曲面上的小格axis off; %关闭坐标系figure(2); %建立图形窗口2F1=histeq(F); %扩展F的对比度以增强视觉效果imshow(F1); %用图像来显示幅度频谱，如图2.3(c)第3章图像变换3.4.4 二维FFT的MATLAB实现例3.2 简单图像及其傅里叶变换MATLAB程序：%建立简单图像d并显示之d = zeros(32,32); %图像大小32⨯32d(13:20,13:20) = 1; %中心白色方块大小为8⨯8figure(1); %建立图形窗口1imshow(d,'notruesize')；%显示图像d如图3.5(a)所示%计算傅里叶变换并显示之D = fft2(d); %计算图像d的傅里叶变换，fft2(d) = fft(fft(d).').'figure(2); %建立图形窗口2imshow(abs(D),[-1 5],'notruesize'); %显示图像d的傅里叶变换谱如3.5(b)所示例3.3 MATLAB图像及其傅里叶变换谱MATLAB程序：figure(1);load imdemos saturn2; %装入MA TLAB图像saturn2imshow(saturn2); %显示图像saturn2如图3.6(a)所示figure(2);S= fftshift(fft2(saturn2)); %计算傅里叶变换并移位imshow(log(abs(S)),[ ]); %显示傅里叶变换谱如3.6(b)所示例3.4 真彩图像及其傅里叶变换谱MATLAB程序：figure(1);A=imread('image1.jpg'); %装入真彩图像，见图1.1(b)B=rgb2gray(A); %将真彩图像转换为灰度图像imshow(B); %显示灰度图像如图3.7(a)所示C=fftshift(fft2(B)); %计算傅里叶变换并移位figure(2);imshow(log(abs(C)),[ ]); %显示傅里叶变换谱如3.7(b)所示3.5.4 离散余弦变换的MATLAB实现例3.5 计算并显示真彩图像余弦变换的MATLAB程序如下：RGB=imread('image2.jpg'); %装入真彩图像figure(1);imshow(RGB); %显示彩色图像GRAY=rgb2gray(RGB); %将真彩图像转换为灰度图像figure(2);imshow(GRAY); %显示灰度图像如图3.10(a)所示DCT=dct2(GRAY); %进行余弦变换figure(3);imshow(log(abs(DCT)),[ ]); %显示余弦变换如图3.10(b)所示。
Matlab100个实例程序
程序代码：(代码标记[code]...[/code] ) 1-32是：图形应用篇33-66是：界面设计篇67-84是：图形处理篇85-100是：数值分析篇实例1：三角函数曲线（1）function shili01h0=figure('toolbar','none',...'position',[198****0300],...'name','实例01');h1=axes('parent',h0,...'visible','off');x=-pi:0.05:pi;y=sin(x);plot(x,y);xlabel('自变量X');ylabel('函数值Y');title('SIN( )函数曲线');grid on实例2：三角函数曲线（2）function shili02h0=figure('toolbar','none',...'position',[200 150 450 350],...'name','实例02');x=-pi:0.05:pi;y=sin(x)+cos(x);plot(x,y,'-*r','linewidth',1);grid onxlabel('自变量X');ylabel('函数值Y');title('三角函数');实例3：图形的叠加function shili03h0=figure('toolbar','none',...'position',[200 150 450 350],...'name','实例03');x=-pi:0.05:pi;y1=sin(x);y2=cos(x);plot(x,y1,...'-*r',...x,y2,...'--og');grid onxlabel('自变量X');ylabel('函数值Y');title('三角函数');实例4：双y轴图形的绘制function shili04h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例04');x=0:900;a=1000;b=0.005;y1=2*x;y2=cos(b*x);[haxes,hline1,hline2]=plotyy(x,y1,x,y2,'semilogy','plot'); axes(haxes(1))ylabel('semilog plot');axes(haxes(2))ylabel('linear plot');实例5：单个轴窗口显示多个图形function shili05h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例05');t=0:pi/10:2*pi;[x,y]=meshgrid(t);subplot(2,2,1)plot(sin(t),cos(t))axis equalsubplot(2,2,2)z=sin(x)-cos(y);plot(t,z)axis([0 2*pi -2 2])subplot(2,2,3)h=sin(x)+cos(y);plot(t,h)axis([0 2*pi -2 2])subplot(2,2,4)g=(sin(x).^2)-(cos(y).^2);plot(t,g)axis([0 2*pi -1 1])实例6：图形标注function shili06h0=figure('toolbar','none',...'position',[200 150 450 400],...'name','实例06');t=0:pi/10:2*pi;h=plot(t,sin(t));xlabel('t=0到2\pi','fontsize',16);ylabel('sin(t)','fontsize',16);title('\it{从0to2\pi 的正弦曲线}','fontsize',16) x=get(h,'xdata');y=get(h,'ydata');imin=find(min(y)==y);imax=find(max(y)==y);text(x(imin),y(imin),...['\leftarrow最小值=',num2str(y(imin))],... 'fontsize',16)text(x(imax),y(imax),...['\leftarrow最大值=',num2str(y(imax))],...'fontsize',16)实例7：条形图形function shili07h0=figure('toolbar','none',...'position',[200 150 450 350],...'name','实例07');tiao1=[562 548 224 545 41 445 745 512];tiao2=[47 48 57 58 54 52 65 48];t=0:7;bar(t,tiao1)xlabel('X轴');ylabel('TIAO1值');h1=gca;h2=axes('position',get(h1,'position'));plot(t,tiao2,'linewidth',3)set(h2,'yaxislocation','right','color','none','xticklabel',[])实例8：区域图形function shili08h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例08');x=91:95;profits1=[88 75 84 93 77];profits2=[51 64 54 56 68];profits3=[42 54 34 25 24];profits4=[26 38 18 15 4];area(x,profits1,'facecolor',[0.5 0.9 0.6],...'edgecolor','b',...'linewidth',3)hold onarea(x,profits2,'facecolor',[0.9 0.85 0.7],...'edgecolor','y',...'linewidth',3)hold onarea(x,profits3,'facecolor',[0.3 0.6 0.7],... 'edgecolor','r',...'linewidth',3)hold onarea(x,profits4,'facecolor',[0.6 0.5 0.9],... 'edgecolor','m',...'linewidth',3)hold offset(gca,'xtick',[91:95])set(gca,'layer','top')gtext('\leftarrow第一季度销量')gtext('\leftarrow第二季度销量')gtext('\leftarrow第三季度销量')gtext('\leftarrow第四季度销量')xlabel('年','fontsize',16);ylabel('销售量','fontsize',16);实例9：饼图的绘制function shili09h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例09');t=[54 21 35;68 54 35;45 25 12;48 68 45;68 54 69];x=sum(t);h=pie(x);textobjs=findobj(h,'type','text');str1=get(textobjs,{'string'});val1=get(textobjs,{'extent'});oldext=cat(1,val1{:});names={'商品一：';'商品二：';'商品三：'}; str2=strcat(names,str1);set(textobjs,{'string'},str2)val2=get(textobjs,{'extent'});newext=cat(1,val2{:});offset=sign(oldext(:,1)).*(newext(:,3)-oldext(:,3))/2; pos=get(textobjs,{'position'});textpos=cat(1,pos{:});textpos(:,1)=textpos(:,1)+offset;set(textobjs,{'position'},num2cell(textpos,[3,2]))实例10：阶梯图function shili10h0=figure('toolbar','none',...'position',[200 150 450 400],...'name','实例10');a=0.01;b=0.5;t=0:10;f=exp(-a*t).*sin(b*t);stairs(t,f)hold onplot(t,f,':*')hold offglabel='函数e^{-(\alpha*t)}sin\beta*t的阶梯图'; gtext(glabel,'fontsize',16)xlabel('t=0:10','fontsize',16)axis([0 10 -1.2 1.2])实例11：枝干图function shili11h0=figure('toolbar','none',...'position',[200 150 450 350],...'name','实例11');x=0:pi/20:2*pi;y1=sin(x);y2=cos(x);h1=stem(x,y1+y2);hold onh2=plot(x,y1,'^r',x,y2,'*g');h3=[h1(1);h2];legend(h3,'y1+y2','y1=sin(x)','y2=cos(x)') xlabel('自变量X');ylabel('函数值Y');title('正弦函数与余弦函数的线性组合');实例12：罗盘图function shili12h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例12');winddirection=[54 24 65 84256 12 235 62125 324 34 254];windpower=[2 5 5 36 8 12 76 14 10 8];rdirection=winddirection*pi/180;[x,y]=pol2cart(rdirection,windpower); compass(x,y);desc={'风向和风力','北京气象台','10月1日0：00到','10月1日12：00'};gtext(desc)实例13：轮廓图function shili13h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例13');[th,r]=meshgrid((0:10:360)*pi/180,0:0.05:1); [x,y]=pol2cart(th,r);z=x+i*y;f=(z.^4-1).^(0.25);contour(x,y,abs(f),20)xlabel('实部','fontsize',16);ylabel('虚部','fontsize',16);h=polar([0 2*pi],[0 1]);delete(h)hold oncontour(x,y,abs(f),20)实例14：交互式图形function shili14h0=figure('toolbar','none',...'position',[200 150 450 250],... 'name','实例14');axis([0 10 0 10]);hold onx=[];y=[];n=0;disp('单击鼠标左键点取需要的点'); disp('单击鼠标右键点取最后一个点'); but=1;while but==1[xi,yi,but]=ginput(1);plot(xi,yi,'bo')n=n+1;disp('单击鼠标左键点取下一个点'); x(n,1)=xi;y(n,1)=yi;endt=1:n;ts=1:0.1:n;xs=spline(t,x,ts);ys=spline(t,y,ts);plot(xs,ys,'r-');hold off实例15：变换的傅立叶函数曲线function shili15h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例15');axis equalm=moviein(20,gcf);set(gca,'nextplot','replacechildren')h=uicontrol('style','slider','position',... [100 10 500 20],'min',1,'max',20) for j=1:20plot(fft(eye(j+16)))set(h,'value',j)m(:,j)=getframe(gcf);endclf;axes('position',[0 0 1 1]);movie(m,30)实例16：劳伦兹非线形方程的无序活动function shili15h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例15');axis equalm=moviein(20,gcf);set(gca,'nextplot','replacechildren')h=uicontrol('style','slider','position',... [100 10 500 20],'min',1,'max',20) for j=1:20plot(fft(eye(j+16)))set(h,'value',j)m(:,j)=getframe(gcf);endclf;axes('position',[0 0 1 1]);movie(m,30)实例17：填充图function shili17h0=figure('toolbar','none',...'position',[200 150 450 250],... 'name','实例17');t=(1:2:15)*pi/8;x=sin(t);y=cos(t);fill(x,y,'r')axis square offtext(0,0,'STOP',...'color',[1 1 1],...'fontsize',50,...'horizontalalignment','center')实例18：条形图和阶梯形图function shili18h0=figure('toolbar','none',...'position',[200 150 450 250],... 'name','实例18');subplot(2,2,1)x=-3:0.2:3;y=exp(-x.*x);bar(x,y)title('2-D Bar Chart')subplot(2,2,2)x=-3:0.2:3;y=exp(-x.*x);bar3(x,y,'r')title('3-D Bar Chart')subplot(2,2,3)x=-3:0.2:3;y=exp(-x.*x);stairs(x,y)title('Stair Chart')subplot(2,2,4)x=-3:0.2:3;y=exp(-x.*x);barh(x,y)title('Horizontal Bar Chart')实例19：三维曲线图function shili19h0=figure('toolbar','none',...'position',[200 150 450 400],... 'name','实例19');subplot(2,1,1)x=linspace(0,2*pi);y1=sin(x);y2=cos(x);y3=sin(x)+cos(x);z1=zeros(size(x));z2=0.5*z1;z3=z1;plot3(x,y1,z1,x,y2,z2,x,y3,z3) grid onxlabel('X轴');ylabel('Y轴');zlabel('Z轴');title('Figure1:3-D Plot')subplot(2,1,2)x=linspace(0,2*pi);y1=sin(x);y2=cos(x);y3=sin(x)+cos(x);z1=zeros(size(x));z2=0.5*z1;z3=z1;plot3(x,z1,y1,x,z2,y2,x,z3,y3) grid onxlabel('X轴');zlabel('Z轴');title('Figure2:3-D Plot')实例20：图形的隐藏属性function shili20h0=figure('toolbar','none',...'position',[200 150 450 300],... 'name','实例20');subplot(1,2,1)[x,y,z]=sphere(10);mesh(x,y,z)axis offtitle('Figure1:Opaque')hidden onsubplot(1,2,2)[x,y,z]=sphere(10);mesh(x,y,z)axis offtitle('Figure2:Transparent') hidden off实例21：PEAKS函数曲线function shili21h0=figure('toolbar','none',...'position',[200 100 450 450],... 'name','实例21');[x,y,z]=peaks(30);subplot(2,1,1)x=x(1,:);y=y(:,1);i=find(y>0.8&y<1.2);j=find(x>-0.6&x<0.5);z(i,j)=nan*z(i,j);surfc(x,y,z)xlabel('X轴');ylabel('Y轴');title('Figure1:surfc函数形成的曲面')subplot(2,1,2)x=x(1,:);y=y(:,1);i=find(y>0.8&y<1.2);j=find(x>-0.6&x<0.5);z(i,j)=nan*z(i,j);surfl(x,y,z)xlabel('X轴');ylabel('Y轴');zlabel('Z轴');title('Figure2:surfl函数形成的曲面')实例22：片状图function shili22h0=figure('toolbar','none',...'position',[200 150 550 350],...'name','实例22');subplot(1,2,1)x=rand(1,20);y=rand(1,20);z=peaks(x,y*pi);t=delaunay(x,y);trimesh(t,x,y,z)hidden offtitle('Figure1:Triangular Surface Plot');subplot(1,2,2)x=rand(1,20);y=rand(1,20);z=peaks(x,y*pi);t=delaunay(x,y);trisurf(t,x,y,z)title('Figure1:Triangular Surface Plot');实例23：视角的调整function shili23h0=figure('toolbar','none',...'position',[200 150 450 350],... 'name','实例23');x=-5:0.5:5;[x,y]=meshgrid(x);r=sqrt(x.^2+y.^2)+eps;z=sin(r)./r;subplot(2,2,1)surf(x,y,z)xlabel('X-axis')ylabel('Y-axis')zlabel('Z-axis')title('Figure1')view(-37.5,30)subplot(2,2,2)surf(x,y,z)xlabel('X-axis')ylabel('Y-axis')zlabel('Z-axis')title('Figure2')view(-37.5+90,30)subplot(2,2,3)surf(x,y,z)xlabel('X-axis')ylabel('Y-axis')zlabel('Z-axis')title('Figure3')view(-37.5,60)subplot(2,2,4)surf(x,y,z)xlabel('X-axis')ylabel('Y-axis')zlabel('Z-axis')title('Figure4')view(180,0)实例24：向量场的绘制function shili24h0=figure('toolbar','none',...'position',[200 150 450 350],... 'name','实例24');subplot(2,2,1)z=peaks;ribbon(z)title('Figure1')subplot(2,2,2)[x,y,z]=peaks(15);[dx,dy]=gradient(z,0.5,0.5); contour(x,y,z,10)hold onquiver(x,y,dx,dy)hold offtitle('Figure2')subplot(2,2,3)[x,y,z]=peaks(15);[nx,ny,nz]=surfnorm(x,y,z);surf(x,y,z)hold onquiver3(x,y,z,nx,ny,nz)hold offtitle('Figure3')subplot(2,2,4)x=rand(3,5);y=rand(3,5);z=rand(3,5);c=rand(3,5);fill3(x,y,z,c)grid ontitle('Figure4')实例25：灯光定位function shili25h0=figure('toolbar','none',...'position',[200 150 450 250],... 'name','实例25');vert=[1 1 1;1 2 1;2 2 1;2 1 1;1 1 2;12 2;2 2 2;2 1 2];fac=[1 2 3 4;2 6 7 3;4 3 7 8;15 8 4;1 2 6 5;5 6 7 8];grid offsphere(36)h=findobj('type','surface');set(h,'facelighting','phong',...'facecolor',...'interp',...'edgecolor',[0.4 0.4 0.4],...'backfacelighting',...'lit')hold onpatch('faces',fac,'vertices',vert,... 'facecolor','y');light('position',[1 3 2]);light('position',[-3 -1 3]); material shinyaxis vis3d offhold off实例26：柱状图function shili26h0=figure('toolbar','none',...'position',[200 50 450 450],...'name','实例26');subplot(2,1,1)x=[5 2 18 7 39 8 65 5 54 3 2];bar(x)xlabel('X轴');ylabel('Y轴');title('第一子图');subplot(2,1,2)y=[5 2 18 7 39 8 65 5 54 3 2];barh(y)xlabel('X轴');ylabel('Y轴');title('第二子图');实例27：设置照明方式function shili27h0=figure('toolbar','none',...'position',[200 150 450 350],... 'name','实例27');subplot(2,2,1)sphereshading flatcamlight leftcamlight rightlighting flatcolorbaraxis offtitle('Figure1')subplot(2,2,2)sphereshading flatcamlight leftcamlight rightlighting gouraudcolorbaraxis offtitle('Figure2')subplot(2,2,3)sphereshading interpcamlight rightcamlight leftlighting phongcolorbaraxis offtitle('Figure3')subplot(2,2,4)sphereshading flatcamlight leftcamlight rightlighting nonecolorbaraxis offtitle('Figure4')实例28：羽状图function shili28h0=figure('toolbar','none',...'position',[200 150 450 350],... 'name','实例28');subplot(2,1,1)alpha=90:-10:0;r=ones(size(alpha));m=alpha*pi/180;n=r*10;[u,v]=pol2cart(m,n);feather(u,v)title('羽状图')axis([0 20 0 10])subplot(2,1,2)t=0:0.5:10;x=0.05+i;y=exp(-x*t);feather(y)title('复数矩阵的羽状图')实例29：立体透视（1）function shili29h0=figure('toolbar','none',...'position',[200 150 450 250],... 'name','实例29');[x,y,z]=meshgrid(-2:0.1:2,...-2:0.1:2,...-2:0.1:2);v=x.*exp(-x.^2-y.^2-z.^2); grid onfor i=-2:0.5:2;h1=surf(linspace(-2,2,20),...linspace(-2,2,20),...zeros(20)+i);rotate(h1,[1 -1 1],30)dx=get(h1,'xdata');dy=get(h1,'ydata');dz=get(h1,'zdata');delete(h1)slice(x,y,z,v,[-2 2],2,-2)hold onslice(x,y,z,v,dx,dy,dz)hold offaxis tightview(-5,10)drawnowend实例30：立体透视（2）function shili30h0=figure('toolbar','none',...'position',[200 150 450 250],... 'name','实例30');[x,y,z]=meshgrid(-2:0.1:2,...-2:0.1:2,...-2:0.1:2);v=x.*exp(-x.^2-y.^2-z.^2); [dx,dy,dz]=cylinder;slice(x,y,z,v,[-2 2],2,-2)for i=-2:0.2:2h=surface(dx+i,dy,dz);rotate(h,[1 0 0],90)xp=get(h,'xdata');yp=get(h,'ydata');zp=get(h,'zdata');delete(h)hold onhs=slice(x,y,z,v,xp,yp,zp);axis tightxlim([-3 3])view(-10,35)drawnowdelete(hs)hold offend实例31：表面图形function shili31h0=figure('toolbar','none',...'position',[200 150 550 250],...'name','实例31');subplot(1,2,1)x=rand(100,1)*16-8;y=rand(100,1)*16-8;r=sqrt(x.^2+y.^2)+eps;z=sin(r)./r;xlin=linspace(min(x),max(x),33); ylin=linspace(min(y),max(y),33); [X,Y]=meshgrid(xlin,ylin);Z=griddata(x,y,z,X,Y,'cubic'); mesh(X,Y,Z)axis tighthold onplot3(x,y,z,'.','Markersize',20)subplot(1,2,2)k=5;n=2^k-1;theta=pi*(-n:2:n)/n;phi=(pi/2)*(-n:2:n)'/n;X=cos(phi)*cos(theta);Y=cos(phi)*sin(theta);Z=sin(phi)*ones(size(theta)); colormap([0 0 0;1 1 1])C=hadamard(2^k);surf(X,Y,Z,C)axis square实例32：沿曲线移动的小球h0=figure('toolbar','none',...'position',[198****8468],... 'name','实例32');h1=axes('parent',h0,...'position',[0.15 0.45 0.7 0.5],... 'visible','on');t=0:pi/24:4*pi;y=sin(t);plot(t,y,'b')n=length(t);h=line('color',[0 0.5 0.5],...'linestyle','.',...'markersize',25,...'erasemode','xor');k1=uicontrol('parent',h0,...'style','pushbutton',...'position',[80 100 50 30],...'string','开始',...'callback',[...'i=1;',...'k=1;,',...'m=0;,',...'while 1,',...'if k==0,',...'break,',...'end,',...'if k~=0,',...'set(h,''xdata'',t(i),''ydata'',y(i)),',...'drawnow;,',...'i=i+1;,',...'if i>n,',...'m=m+1;,',...'i=1;,',...'end,',...'end,',...'end']);k2=uicontrol('parent',h0,...'style','pushbutton',...'position',[180 100 50 30],...'string','停止',...'callback',[...'k=0;,',...'set(e1,''string'',m),',...'p=get(h,''xdata'');,',...'q=get(h,''ydata'');,',...'set(e2,''string'',p);,',...'set(e3,''string'',q)']);k3=uicontrol('parent',h0,...'style','pushbutton',...'position',[280 100 50 30],... 'string','关闭',...'callback','close');e1=uicontrol('parent',h0,...'style','edit',...'position',[60 30 60 20]);t1=uicontrol('parent',h0,...'style','text',...'string','循环次数',...'position',[60 50 60 20]);e2=uicontrol('parent',h0,...'style','edit',...'position',[180 30 50 20]);t2=uicontrol('parent',h0,...'style','text',...'string','终点的X坐标值',...'position',[155 50 100 20]);e3=uicontrol('parent',h0,...'style','edit',...'position',[300 30 50 20]);t3=uicontrol('parent',h0,...'style','text',...'string','终点的Y坐标值',...'position',[275 50 100 20]);实例33：曲线转换按钮h0=figure('toolbar','none',...'position',[200 150 450 250],... 'name','实例33');x=0:0.5:2*pi;y=sin(x);h=plot(x,y);grid on'if i==1,',...'i=0;,',...'y=cos(x);,',...'delete(h),',...'set(hm,''string'',''正弦函数''),',...'h=plot(x,y);,',...'grid on,',...'else if i==0,',...'i=1;,',...'y=sin(x);,',...'set(hm,''string'',''余弦函数''),',...'delete(h),',...'h=plot(x,y);,',...'grid on,',...'end,',...'end'];hm=uicontrol(gcf,'style','pushbutton',... 'string','余弦函数',...'callback',huidiao);i=1;set(hm,'position',[250 20 60 20]);set(gca,'position',[0.2 0.2 0.6 0.6]) title('按钮的使用')hold on实例34：栅格控制按钮h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例34');x=0:0.5:2*pi;y=sin(x);plot(x,y)huidiao1=[...'set(h_toggle2,''value'',0),',...'grid on,',...];'set(h_toggle1,''value'',0),',...'grid off,',...];h_toggle1=uicontrol(gcf,'style','togglebutton',... 'string','grid on',...'value',0,...'position',[20 45 50 20],...'callback',huidiao1);h_toggle2=uicontrol(gcf,'style','togglebutton',... 'string','grid off',...'value',0,...'position',[20 20 50 20],...'callback',huidiao2);set(gca,'position',[0.2 0.2 0.6 0.6])title('开关按钮的使用')实例35：编辑框的使用h0=figure('toolbar','none',...'position',[200 150 350 250],...'name','实例35');f='Please input the letter';huidiao1=[...'g=upper(f);,',...'set(h2_edit,''string'',g),',...];huidiao2=[...'g=lower(f);,',...'set(h2_edit,''string'',g),',...];h1_edit=uicontrol(gcf,'style','edit',...'position',[100 200 100 50],...'HorizontalAlignment','left',...'string','Please input the letter',...'callback','f=get(h1_edit,''string'');',...'background','w',...'max',5,...'min',1);h2_edit=uicontrol(gcf,'style','edit',...'HorizontalAlignment','left',...'position',[100 100 100 50],...'background','w',...'max',5,...'min',1);h1_button=uicontrol(gcf,'style','pushbutton',... 'string','小写变大写',...'position',[100 45 100 20],...'callback',huidiao1);h2_button=uicontrol(gcf,'style','pushbutton',... 'string','大写变小写',...'position',[100 20 100 20],...'callback',huidiao2);实例36：弹出式菜单h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例36');x=0:0.5:2*pi;y=sin(x);h=plot(x,y);grid onhm=uicontrol(gcf,'style','popupmenu',...'string',...'sin(x)|cos(x)|sin(x)+cos(x)|exp(-sin(x))',... 'position',[250 20 50 20]);set(hm,'value',1)huidiao=[...'v=get(hm,''value'');,',...'switch v,',...'case 1,',...'delete(h),',...'y=sin(x);,',...'h=plot(x,y);,',...'grid on,',...'case 2,',...'delete(h),',...'y=cos(x);,',...'h=plot(x,y);,',...'grid on,',...'case 3,',...'delete(h),',...'y=sin(x)+cos(x);,',...'h=plot(x,y);,',...'grid on,',...'case 4,',...'delete(h),',...'y=exp(-sin(x));,',...'h=plot(x,y);,',...'grid on,',...'end'];set(hm,'callback',huidiao)set(gca,'position',[0.2 0.2 0.6 0.6]) title('弹出式菜单的使用')实例37：滑标的使用h0=figure('toolbar','none',...'position',[200 150 450 250],... 'name','实例37');[x,y]=meshgrid(-8:0.5:8);r=sqrt(x.^2+y.^2)+eps;z=sin(r)./r;h0=mesh(x,y,z);h1=axes('position',...[0.2 0.2 0.5 0.5],...'visible','off');htext=uicontrol(gcf,...'units','points',...'position',[20 30 45 15],...'string','brightness',...'style','text');hslider=uicontrol(gcf,...'units','points',...'position',[10 10 300 15],...'min',-1,...'max',1,...'style','slider',...'callback',...'brighten(get(hslider,''value''))');实例38：多选菜单h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例38');[x,y]=meshgrid(-8:0.5:8);r=sqrt(x.^2+y.^2)+eps;z=sin(r)./r;h0=mesh(x,y,z);hlist=uicontrol(gcf,'style','listbox',...'string','default|spring|summer|autumn|winter',... 'max',5,...'min',1,...'position',[20 20 80 100],...'callback',[...'k=get(hlist,''value'');,',...'switch k,',...'case 1,',...'colormap default,',...'case 2,',...'colormap spring,',...'case 3,',...'colormap summer,',...'case 4,',...'colormap autumn,',...'case 5,',...'colormap winter,',...'end']);实例39：菜单控制的使用h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例39');x=0:0.5:2*pi;y=cos(x);h=plot(x,y);grid onset(gcf,'toolbar','none')hm=uimenu('label','example');huidiao1=[...'set(hm_gridon,''checked'',''on''),',...'set(hm_gridoff,''checked'',''off''),',...'grid on'];huidiao2=[...'set(hm_gridoff,''checked'',''on''),',...'set(hm_gridon,''checked'',''off''),',...'grid off'];hm_gridon=uimenu(hm,'label','grid on',... 'checked','on',...'callback',huidiao1);hm_gridoff=uimenu(hm,'label','grid off',... 'checked','off',...'callback',huidiao2);实例40：UIMENU菜单的应用h0=figure('toolbar','none',...'position',[200 150 450 250],...'name','实例40');h1=uimenu(gcf,'label','函数');h11=uimenu(h1,'label','轮廓图',...'callback',[...'set(h31,''checked'',''on''),',...'set(h32,''checked'',''off''),',...'[x,y,z]=peaks;,',...'contour3(x,y,z,30)']);h12=uimenu(h1,'label','高斯分布',...。
matlab十个简单案例编写
matlab十个简单案例编写1. 求解线性方程组线性方程组是数学中常见的问题之一，而MATLAB提供了用于求解线性方程组的函数。
例如，我们可以使用"linsolve"函数来求解以下线性方程组：2x + 3y = 74x - 2y = 2代码如下所示：A = [2, 3; 4, -2];B = [7; 2];X = linsolve(A, B);disp(X);解释：上述代码定义了一个2x2的矩阵A和一个2x1的矩阵B，分别表示线性方程组的系数矩阵和常数向量。
然后，使用linsolve函数求解线性方程组，结果存储在X中，并通过disp函数打印出来。
运行代码后，可以得到x=2和y=1的解。
2. 求解非线性方程除了线性方程组外，MATLAB还可以用于求解非线性方程。
例如，我们可以使用"fzero"函数求解以下非线性方程：x^2 + 2x - 3 = 0代码如下所示：fun = @(x) x^2 + 2*x - 3;x0 = 0;x = fzero(fun, x0);disp(x);解释：上述代码定义了一个匿名函数fun，表示非线性方程。
然后，使用fzero函数传入fun和初始值x0来求解非线性方程的根，并通过disp函数打印出来。
运行代码后，可以得到x=1的解。
3. 绘制函数图像MATLAB提供了强大的绘图功能，可以帮助我们可视化函数的形状和特征。
例如，我们可以使用"plot"函数绘制以下函数的图像：y = cos(x)代码如下所示：x = linspace(0, 2*pi, 100);y = cos(x);plot(x, y);解释：上述代码首先使用linspace函数生成一个从0到2π的100个等间距点的向量x，然后计算对应的cos值，并存储在向量y中。
最后，使用plot函数将x和y作为横纵坐标绘制出函数图像。
运行代码后，可以看到cos函数的周期性波动图像。
matlab操作大全
MATLAB常用操作大全1.点乘，点除，点乘方点乘(对应元素相乘),必须同维或者其中一个是标量，a.*b点除，a.\b表示矩阵b的每个元素除以a中对应元素或者除以常数a，a./b表示常数a除以矩阵b中每个元素或者矩阵a除以矩阵b对应元素或者常数b点乘方a.^b,矩阵a中每个元素按b中对应元素乘方或者b是常数2.矩阵中元素的操作矩阵a中第r行，a(r,:),第r列，a(:,r),依次提取每一列组成一个列向量a(:),提取子矩阵第i到j行和第k到t列a(i:j,k:t)可以通过下标引用，但是元素下标从1开始，也可通过序号引用，但是按列存储，也就是说对于3*3的矩阵a，a(4)是a(1,2)不是a(2,1)3.求极限syms x;f表达式limit(f,0)//表示x趋于0时的极限4.因式分解syms xfactor(表达式)5.求积分syms xint(y,3,4)//在区间3到4求积分或者quad('sin(x)',4,6) %必加引号5 . 求n阶导数diff（函数表达式，阶数n）//注意并不是在x = n时的一阶导数值6.解一元方程syms xy = X^3 - 1//y必须是个式子，也就是说x必须是符号变量不可是具体的数，否则一直空解solve(y)或者求方程3x4+7x3 +9x2-23=0的全部根。
p=[3,7,9,0,-23]; %建立多项式系数向量x=roots(p) %求根7.whos用于显示驻留在工作区内的变量的详细信息，采用clear 变量名把该变量清理出内存8.linspace(a,b,n) 其中a和b是生成向量的第一个和最后一个元素，n是元素总数。
显然，linspace(a,b,n)与a:(b-a)/(n-1):b等价。
9.size(矩阵名)，输出行数和列数，比如产生和矩阵a同维的全一阵，ones(size(a))10.常用的产生通用特殊矩阵的函数有：zeros：产生全0矩阵(零矩阵)。
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MATLAB简单程序大全求特征值特征向量A=[2 3 4;1 5 9;8 5 2]det(A)A'rank(A)inv(A)rref(A)eig(A)%求特征值和特征向量卫星运行问题h=200,H=51000,R=6378;a=(h+H+2*R)/2;c=(H-h)/2;b=(a^2-c^2)^(1/2);e=c/a;f=sqrt(1-exp(2).*cos(t)^2);l=int(f,t,0,pi/2)L=4*a.*l动态玫瑰线n=3;N=10000;theta=2*pi*(0:N)/N;r=cos(n*theta);x=r.*cos(theta);y=r.*sin(theta);comet(x,y)二重积分syms x yf=x^2*sin(y);int(int(f,x,0,1),y,0,pi)ezmesh(f,[0,1,0,pi])函数画图syms x;f=exp(-0.2*x)*sin(0.5*x);ezplot(f,[0,8*pi])玫瑰线theta=0:0.01:2*pi;r=cos(3*theta);polar(theta,r,'r')求x^2+y^2=1和x^2+z^2=1所围成的体积syms x y z Rr=1;Z=sqrt(1-x^2);y0=Z;V=8*int(int(Z,y,0,y0),x,0,1)求导数及图像f='1/(5+4*cos(x))';subplot(1,2,1);ezplot(f)f1=diff(f)subplot(1,2,2);ezplot(f1)绕x轴旋转t=(0:20)*pi/10;r=exp(-.2*t).*sin(.5*t);theta=t;x=t'*ones(size(t));y=r'*cos(theta);z=r'*sin(theta);mesh(x,y,z)colormap([0 0 0])某年是否闰年year=input('input year:=');n1=year/4;n2=year/100;n3=year/400;if n1==fix(n1)&n2~=fix(n2)disp('是闰年')elseif n1==fix(n1)&n3==fix(n3) disp('是闰年')elsedisp('不是闰年')End玫瑰线的绘制theta=0:0.001:2*pi;rho=2*cos(3*theta);figure(1);polar(theta,rho)x=rho.*cos(theta);y=rho.*sin(theta);figure(2);comet(x,y)相遇问题function k=moto(A,B)if nargin==0,A=0;B=100;end va=10;vb=8;vc=60;f=1;k=0;while(B-A)>0.2if f==1tk=(B-A)/(vb+vc);elsetk=(B-A)/(vc+va);endA=A+va*tk;B=B-vb*tk;f=-f;k=k+1;End数学实验syms x; x=1:100;f(x)=exp(-0.2*x).*sin(0.5*x); syms x; x=1:100;f(x)=exp(-0.2*x).*sin(0.5*x); plot(x,f(x))syms x; x=0:0.1:2*pi;f(x)=exp(-0.2*x)*sin(0.5*x);plot(x,f(x))syms x; x=0:0.1:2*pi;f(x)=exp(-0.2*x).*sin(0.5*x);plot(x,f(x))syms x; x=0:0.1:2*pi;f(x)=exp(-0.2*x).*sin(0.5*x); zplot(x,f(x))clcf=sym('sin(x)/x');limit(f)f1=sym('(1+a/x)^x')limit(f1)f1=sym('(1+a/x)^x'),x=inf;limit(f1)clcf1=sym('(1+1/x)^x');limit(f1,'inf')f1=sym('(1+1/x)^x');limit(f1,'inf')clcf1=sym('(1+1/x)^x');limit(f1,'x',inf)Clc相遇问题A=0;B=100;va=10;vb=8;vc=60;f=1;k=0;plot(A,0,'ro',B,0,'go'),hold on while(B-A)>0.2if f==1tk=(B-A)/(vb+vc);elsetk=(B-A)/(vc+va);endA=A+va*tk;B=B-vb*tk;plot(A,0,'R.',B,0,'g.'),pause(1)f=-f;k=k+1;endk,tk,A,B数学实验f=[0 9 13.5;0.1 0 0;0 0.2 0]x=[100;100;100]y=xfor n=1:3x=f*xy=[y,x]endyfigure(1),bar(y(1,:))figure(2),bar(y(2,:))figure(3),bar(y(3,:))[p,d]=eig(f)a=p(:,1)b=a/sum(a)x1=b*300y1=x1for n=1:3x1=f*x1y1=[y1,x1]endy1figure(4),bar(y1(1,:))figure(5),bar(y1(2,:))figure(6),bar(y1(3,:))杨辉三角function Y=yang(n)if nargin==0,n=3;endY=eye(n);Y(:,1)=ones(n,1);for k=3:nY(k,2:k-1)=Y(k-1,1:k-2)+Y(k-1,2:k-1);End实例2 寻找水仙花数一、实验内容数153有一个特殊的性质,即153=1^3+5^3+3^3,那么有没有其他这样的数呢？我们怎样利用MATLAB程序设计快速寻求这些水仙花数呢？二、实验分析把任一数各位数字的立方和求出,再求所得的各位数字的立方和,依次进行下去,总可以得到一个水仙花数.如把76按这样的运算进行下去:333333333333+=++=++=+++= 76559,559979,9791801,1801514, 333333333333++=++=++=++= 514190,190730,730370,370370结果得到一个水仙花数370。
三、实验程序（寻求水仙花数经典的程序）for a=1:9for b=0:9;for c=0:9;if a^3+b^3+c^3==a*100+b*10+c;sxh=a*100+b*10+cendendendend四、实验结果sxh =153，370, 371, 407。
实例4 住房贷款的等额本息还款法计算一、实验内容当前在银行放贷项目中，住房按揭贷款占相当大的比重。
这一贷款促进了房地产事业的迅速发展，它不但改善了居民的居住条件，也促进了建筑行业、钢铁行业和其他相关行业的发展，与此同时，也创造了大量的就业机会。
在这中间，银行利率起了巨大的杠杆作用，过高的利率会使按揭购房减少，房价下跌；过低的利率会使按揭贷款购房者数量增加，当房源供不应求时，受供求关系的影响，房价将上涨。
假设某购房者向银行贷款的金额为p0，银行的月利率为a，贷款期限为n 个月，求每月的还款金额为r.二、实验分析我们用等比级数求解：第一月末贷款的本息之和为=+-，p p a r(1)0(1)第二月末贷款的本息之和为：2p p a r p a r a r=+-=+-+-，(2)(1)(1)0(1)(1)第三月末贷款的本息之和为32=+-=+-+-+-，(3)(2)(1)0(1)(1)(1)p p a r p a r a r a r第n月末贷款的本息之和为1()(1)(1)0(1)[(1)...(1)1]n n p n p n a r p a r a a -=-+-=+-+++++， 考虑第n 个月还清贷款，则p(n)=0,求得0*(1)/[(1)1]n n r p a a a =++-.假设银行贷款20万，月利率0.465%，借款期限为10年，即为120个月，问每月应还金额和10年内共计支付多少利息。
三、实验程序n=120;p0=2e+6;a=0.00465;r=p0*a*(1+a)^n/((1+a)^n-1) %每月还款金额interest=r*n-p0 %10年内应支付的利息四、实验结果r =2.1785e+004, 即每个月还款2178.5元。
interest =6.1415e+005，即10应支付的利息为61415元。