MATLAB: How to make mesh plot and contour plot.

contour and mesh plots

Why does this code generate my Z value as a single row?
clear; clc;
 
x = linspace(-4,4,40);y = linspace(-3,5,40);
[X,Y] = meshgrid(x,y);
Z = (2.*x.^2)+(3.*y.^2)-(4.*x.*y)-y-(3.*x);
subplot(1,2,1);
cs = contour(X,Y,Z);clabel(cs);
xlabel('x');ylabel('y');
title('(a) Contour plot');grid;
subplot(1,2,2);
cs = surfc(X,Y,Z);
zmin = floor(min(Z));
zmax = ceil(max(Z));
xlabel('x');ylabel('y');zlabel('f(x,y)');
title ('(b) Mesh plot');

Best Answer

Z = (2.*X.^2)+(3.*Y.^2)-(4.*X.*Y)-Y-(3.*X);    %use the grid versions of x, y rather than the vectors
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