Question

用matlab画个函数图y=0.0789+0.0010*x1 -0.0172*x2-0.000020602*x1.^2+0.0009*x2.^2

其中22<x1<25,11<x2<13谢谢！急用啊

Answer 1

x1=[22:0.01:25];

x2=[11:0.01:13];

[X,Y]=meshgrid(x1,x2);

mesh(X,Y,0.0789+0.0010.*X-0.0172.*Y-0.000020602.*X.^2+0.0009.*Y.^2)

 

追问

如果固定X1=23.5， X2的范围还是大于11小于13，这样怎么画啊？谢谢！

追答

x1=23.5;

x2=[11:0.01:13];

plot(x2,0.0789+0.0010*x1-0.0172.*x2-0.000020602*x1^2+0.0009.*x2.^2)

Answer 2

x1=22:0.5:25;

x2=11:0.5:13;

x1m=repmat(x1,length(x2),1);

x2m=repmat(x2'银纳,1,length(x1));

y=0.0789+0.0010*x1m -0.0172*x2m-0.000020602*x1m.^2+0.0009*x2m.^2;

mesh(x1,x2,y)

xlabel('x1');ylabel('x2');zlabel('裤搏袜y');

figure;

surf(x1,x2,y)

xlabel('x1');ylabel('x2');zlabel('y');

 

 

 

 

 

分别用mesh，和surf函数画的胡激，希望对你有帮助。

Answer 3