How to make this surface?

z = y*x

0<x<5

x/2<y<2

Answer 1

[Akira Agata]

Straight-foward solution would be like this:

x = linspace(0,5);
y = linspace(0,2);

[xGrid, yGrid] = meshgrid(x,y);
zGrid = yGrid.*xGrid;

idx = xGrid./2 < yGrid;
zGrid(idx) = nan;

figure
surf(xGrid,yGrid,zGrid)