How to make this surface?
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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)
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