MATLAB: Error using mesh, Z must be a matrix

errormatrixmesh

I don't know why, but z won't be registered as a martix even when it calculates it as amtrix.

x=linspace(0,4,2);

y=linspace(0,4,2);

z=sin(pi.*x).*sin(pi.*y);

mesh(x,y,z)

Espen, use

 x = linspace(0,4,20);
 y = linspace(0,4,20);
 [X,Y] = meshgrid(x,y);  % create a grid of data points
 Z     = sin(pi.*X).*sin(pi.*Y);
 mesh(X,Y,Z)

Z needs to be an n-by-m, just like X and Y.

You were very close: you only forgot to change x to X and y to Y after you added meshgrid.

x=linspace(0,2*pi);
y=linspace(0, pi);
[X,Y]= meshgrid(x,y);
Z=sin(3*X).^2.*cos(4*Y).^3;
surf(X,Y,Z)

(next time, select your code and click the {}Code button to correctly format your code)

Are you constructing your x and y coordinates using meshgrid() ? If you are, use ndgrid() instead.

[x, y] = ndgrid(.....);
mesh(x, y, z)