北京科技大学数据结构上机考试

《认识实习》数学信计15考试报告（2017.07.14）
N = Convert.ToInt32(textBox1.Text);
k = new int[N, myn];
sum = new int[this.N];
ave = new float[this.N];
float num = 0f;
Random random = new Random();
Brush brush = new SolidBrush(Color.Red);
for (int i = 0; i < N; i++)
{
sum[i] = 0;
for (int j = 0; j < myn; j++)
{
float num2 = (float)random.NextDouble();
float num3 = 0f;
for (int k = 0; k < mym; k++)
{
if (k == 0)
{
num3 = P0[0];
}
else
{
num3 += P0[k];
}
if (num2 <= num3)
{
this.k[i, j] = k + 1;
break;
}
}
sum[i] += k[i, j];
}
num += (float)this.sum[i];
ave[i] = num / (float)(i + 1);
m2.Clear(Color.White);
lenx = (float)this.pictureBox2.ClientSize.Width / m2.DpiX;
leny = (float)this.pictureBox2.ClientSize.Height / m2.DpiY;
Pen pen = new Pen(Color.YellowGreen, 1f / m2.DpiY);
float num4;
for (int k = 1; k < mym; k++)
{
num4 = (float)k * leny / (float)this.mym;
m2.DrawLine(pen, 0f, num4, lenx, num4);
}
float num5;
for (int j = 1; j < myn; j++)
{
num5 = (float)j * lenx / (float)this.myn;
m2.DrawLine(pen, num5, 0f, num5, leny);
}
for (int j = 0; j < myn; j++)
{
num5 = ((float)j + 0.5f) * lenx / (float)this.myn;
num4 = ((float)this.k[i, j] - 0.5f) * leny / (float)this.mym;
m2.FillEllipse(brush, num5, num4, 0.2f, 0.2f);
}
lenx = (float)this.pictureBox1.ClientSize.Width / m1.DpiX;
leny = (float)this.pictureBox1.ClientSize.Height / m1.DpiY;
num5 = ((float)i + 0.5f) * lenx / (float)this.N;
num4 = ((float)(this.sum[i] - myn) + 0.5f) * leny / (float)(this.mym * myn - myn + 1); m1.FillEllipse(brush, num5, num4, 0.05f, 0.05f);
Pen pen2 = new Pen(Color.Gold, 1f / m3.DpiY);
if (i > 0)
{
float num6 = (float)(this.mym * myn - myn + 1) - ave[i - 1];
float num7 = (float)(this.mym * myn - myn + 1) - ave[i];
m3.DrawLine(pen2, (float)(((double)i - 0.5) * (double)this.X3), num6 * Y3, (float)(((double)i + 0.5) * (double)this.X3), num7 * Y3);
}
if (this.checkBox1.Checked)
{
Thread.Sleep((int)Convert.ToInt16(this.textBox2.Text));
}
}
5.在左下角，画出横线为随机变量的期望，累计平均值
Count(this.textBox5.Text);
maxy = 0f;
for (int i = 1; i <= myn; i++)
{
for (int j = 1; j <= mym * i; j++)
{
if (this.Pn[j - 1, i - 1] > maxy)
{
maxy = Pn[j - 1, i - 1];
}
}
}
m4 = pictureBox4.CreateGraphics();
m4.Clear(Color.White);
m4.PageUnit = GraphicsUnit.Inch;
lenx = (float)this.pictureBox4.ClientSize.Width / m4.DpiX;
leny = (float)this.pictureBox4.ClientSize.Height / m4.DpiY; X4 = lenx / (float)(this.mym * myn);
Y4 = leny / maxy;
Brush brush = new SolidBrush(Color.FromArgb(255, 0, 0, 255));
PointF pt = new PointF(0f, 0f);
PointF pt2 = new PointF(0f, 0f);
for (int i = 1; i <= myn; i++)
{
m4.Clear(Color.White);
for (int j = i; j <= mym * i; j++)
{
if ((double)this.Pn[j - 1, i - 1] > 0.001)
{
pt.X = (float)j * X4;
pt.Y = (this.maxy - Pn[j - 1, i - 1]) * Y4;
m4.FillRectangle(brush, pt.X, pt.Y, X4 / 2f, Pn[j - 1, i - 1] * Y4); }
}
Thread.Sleep(500);
}
float啊 = this.啊;
float哦 = this.哦;
float num = 0.1f;
int num2 = (int)(6.0 * Math.Sqrt((double)哦) / (double)num) + 1;
PointF[] array = new PointF[num2];
Pen pen = new Pen(Color.FromArgb(255, 255, 0, 0), 2f / m4.DpiY);
int num3 = 0;
int num4 = 0;
for (float num5 = (float)((double)啊 - 3.0 * Math.Sqrt((double)哦)); num5 <= (float)((double)啊 + 3.0 * Math.Sqrt((double)哦)); num5 += num)
{
float num6 = 1f / (float)Math.Sqrt(6.2831852 * (double)哦) *
(float)Math.Exp((double)(-(double)(num5 - 啊) * (num5 - 啊) / (2f * 哦)));
float x = num5 * X4;
float y = (this.maxy - num6) * Y4;
array[num3].X = x;
array[num3].Y = y;
num3++;
if (num4 == 0)
{
pt.X = x;
pt.Y = y;
num4 = 1;
}
else
{
pt2.X = x;
pt2.Y = y;
m4.DrawLine(pen, pt, pt2);
pt.X = pt2.X;
pt.Y = pt2.Y;
}
Thread.Sleep(10);
}。