MATLAB作业

1.3-1                    1.3-2

输入想x，y的值，将它们互换后输出。    计算分段函数的值。

          

1.3-3                           

大小写字母转换                                    

 

 

 

 

1.3-4

  case的用法

 

 

1.3-5

输出水仙花数

 

1.3-6

求[100~200]之间第一个被21整除的数

 

1.3-7

将华氏温度转化为摄氏度

 

1.3-8

编写函数求半径为r的圆的周长

 

1.3-10                

无穷级数         

                 

1.3-11

生成一个5x10000的 Hilbert长方矩阵，其中第i行第j列元素为h-{i,j}=1/(i+j-1)

 

 

Demo1

n = 128; //把128赋值给n

u = linspace(0,pi,n); //产生n个步长为n/pi的矩阵

v = linspace(0,pi,n); //产生n个步长为n/pi的矩阵

 

u = repmat(u,n,1); // 将矩阵复制n行

v = repmat(v',1,n); //将矩阵复制n列

 

x = cos(v).*sin(u); //将右边的值一一赋值给x并形成一个矩阵

y = sin(v).*sin(u); //将右边的值一一赋值给y并形成y矩阵

z = cos(u); //    将右边的值赋值给z并形成一个矩阵

f = 1/2*((2*x.^2-y.^2-z.^2) + 2*y.*z.*(y.^2-z.^2) +  ...

 z.*x.*(x.^2-z.^2) + x.*y.*(y.^2-x.^2)) //;将右边的值经过函数运算后，一一赋值给f，形成矩阵

g = sqrt(3)/2 * ((y.^2-z.^2) + z.*x.*(z.^2-x.^2) + x.*y.*(y.^2-x.^2)) //;同上

h = (x+y+z).*((x+y+z).^3 + 4*(y-x).*(z-y).*(x-z));  //同上

Clf //清除原有的图形

s = surf(f,g,h/10,u, ...

    'LineStyle','none', ...

    'FaceLighting','gouraud', ...

    'FaceColor','interp'); //制作三维空间立体图，线性设置为无，并采用高氏着色法着色

colormap jet; //colormap类型设置为jet

 

axis off; //axes的样式为off

daspect([1 1 1]); //长宽高之比设置为1

l1 = light; //将light的值赋值给l1

l2 = light; //同上

lightangle(l1,70,-40);//设置光源的方向

lightangle(l2,-30,80);//同上

view(-40,32); //设置二维视角

camzoom(1.5);//输出三维图形

 

Demo2

 

 

         

            

              

         

                

         

 

            

            

 

Search MATLAB Documentation

 

 

 

   

  

 

 

 

 

 

 

 

This example shows how to do some basic matrix manipulations in MATLAB.

 

We start by creating a magic square and assigning it to the variable A.A = magic(3)

A =

 

     8     1     6

     3     5     7   //创建一个三维矩阵

     4     9     2

 

Here's how to add 2 to each element of A.Note that MATLAB requires no special handling of  matrix math.A+2

ans =

 

    10     3     8

     5     7     9    //每个元素的值都叫二

     6    11     4

 

The apostrophe symbol denotes the complex conjugate transpose of a matrix.Here's how to take the transpose of A.A'

ans =

 

     8     3     4

     1     5     9   矩阵的倒置

     6     7     2

 

The symbol * denotes multiplication of matrices.Let's create a new matrix B and multiply A by B.B = 2*ones(3)

A*B

B =

 

     2     2     2

     2     2     2    //计算矩阵A与B的成绩

     2     2     2

 

 

ans =

 

    30    30    30

    30    30    30   A与B相乘

    30    30    30

 

We can also multiply each element of A with its  corresponding element of B by using the  .* operator.A.*B

ans =

 

    16     2    12

     6    10    14   A与B中的元素一一对应相乘

     8    18     4

 

MATLAB has functions for nearly every type of common matrix calculation.  For example, we can find the eigenvalues of A using the "eig" command.eig(A)

ans =

 

   15.0000

    4.8990   

   -4.8990

 

This concludes our brief tour of some MATLAB matrix handling capabilities.

 

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