matlab图形保存及图例的设置和函数.doc

图形的保存的步骤：figure——edit——copy figure

例1：x=[0,0.48,0.84,1,0.91,0.6,0.14];
subplot(2,2,1)
>> plot(x)
>> hold on
>> subplot(2,2,2)
>> plot(x,'*')
>> subplot(2,2,3)
>> plot(x,'-b*')
>> subplot(2,2,4)
>> plot(x,'-k*')

x=0:0.01:2*pi;
>> y1=sin(x);
>> y2=cos(x);
>> plot(x,y1,'b',x,y2,'r')
>> legend('正弦曲线','余弦曲线')
>> title('正弦与余弦曲线')
>> xlabel('x')
>> ylabel('y')

>> x=-5:5

x =

Columns 1 through 9

-5 -4 -3 -2 -1 0 1 2 3

Columns 10 through 11

4 5

>> y=x

y =

Columns 1 through 9

-5 -4 -3 2 -1 0 1 2 3

Columns 10 through 11

4 5

>> [X,Y]=meshgrid(x,y)

X =

Columns 1 through 9

-5 -4 -3 -2 -1 0 1 2 3
-5 -4 -3 -2 -1 0 1 2 3
-5 -4 -3 -2 -1 0 1 2 3
-5 -4 -3 -2 -1 0 1 2 3
-5 -4 -3 -2 -1 0 1 2 3
-5 -4 -3 -2 -1 0 1 2 3
-5 -4 -3 -2 -1 0 1 2 3
-5 -4 -3 -2 -1 0 1 2 3
-5 -4 -3 -2 -1 0 1 2 3
-5 -4 -3 -2 -1 0 1 2 3
-5 -4 -3 -2 -1 0 1 2 3

Columns 10 through 11

4 5
4 5
4 5
4 5
4 5
4 5
4 5
4 5
4 5
4 5
4 5

Y =

Columns 1 through 9

-5 -5 -5 -5 -5 -5 -5 -5 -5
-4 -4 -4 -4 -4 -4 -4 -4 -4
-3 -3 -3 -3 -3 -3 -3 -3 -3
-2 -2 -2 -2 -2 -2 -2 -2 -2
-1 -1 -1 -1 -1 -1 -1 -1 -1
0 0 0 0 0 0 0 0 0
1 1 1 1 1 1 1 1 1
2 2 2 2 2 2 2 2 2
3 3 3 3 3 3 3 3 3
4 4 4 4 4 4 4 4 4
5 5 5 5 5 5 5 5 5

Columns 10 through 11

-5 -5
-4 -4
-3 -3
-2 -2
-1 -1
0 0
1 1
2 2
3 3
4 4
5 5

>> z=X.^2+Y.^2

z =

Columns 1 through 8

50 41 34 29 26 25 26 29
41 32 25 20 17 16 17 20
34 25 18 13 10 9 10 13
29 20 13 8 5 4 5 8
26 17 10 5 2 1 2 5
25 16 9 4 1 0 1 4
26 17 10 5 2 1 2 5
29 20 13 8 5 4 5 8
34 25 18 13 10 9 10 13
41 32 25 20 17 16 17 20
50 41 34 29 26 25 26 29

Columns 9 through 11

34 41 50
25 32 41
18 25 34
13 20 29
10 17 26
9 16 25
10 17 26
13 20 29
18 25 34
25 32 41
34 41 50

>> mesh(X,Y,z)
三位曲线图

>> surf(X,Y,z)
三维曲面绘图函数