How to plot function with conditions (3d)

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Suppose I want to plot the function
% f(x,y) = x.*y by saying:
[x,y] = meshgrid (-2:2:2);
z = x.*y;
But what if I want the x and y values also to fulfill the equation x + y <= 1 ?

Risposta accettata

Ameer Hamza
Ameer Hamza il 6 Dic 2020
You can replace the unwanted values with nan.
[x,y] = meshgrid (-2:2:2);
z = x.*y;
mask = x + y <= 1;
z(~mask) = nan;

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