大家过来看下!关于画z(x,y)=cos(x)exp(-|y|)一阶导!

[gobang]

code:

x=linspace(-10,10,1000);
y=linspace(-10,10,1000);
[x,y]=meshgrid(x,y);
s=cos(x);
t=-abs(y);
u=exp(t);
v=diff(s);
w=diff(u);
z=s.*w+u.*v;
mesh(x,y,z);
grid
xlabel('x'), ylabel('y'), zlabel('z');
title('z'(x,y)');

运行:

??? Error using ==> times
Matrix dimensions must agree.

大家看看问题是什么 先谢谢了

[laosam280]

原因就是绘图命令中的x和y被换成了s，w，u，v
这样改过来就可以了：
x=linspace(0,10,1000);
y=linspace(0,10,1000);
[x,y]=meshgrid(x,y);
s=cos(x);
t=-abs(y);
u=exp(t);
v=diff(s);
w=diff(u);
z=sin(x).*exp(-abs(y))-cos(x).*exp(-abs(y));
mesh(x,y,z);
grid
xlabel('x'), ylabel('y'), zlabel('z');
title('z=(x,y)');