How to draw a 3D graph with constraints?

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DL
DL 2019-10-27
编辑： Vikas Sharma 2021-6-11
I want to draw a 3D graph for a function with several contraints.
For example, f(x,y)=1-0.5*x-0.7*y such that 0<=x<=1, 0<=y<=1, 0<=x+y<=1.
Since I am a beginner of using MATLAB, so any help would be very appreciated.

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John D'Errico
John D'Errico 2019-10-27
The simple answer is to just use meshgrid.
[x,y] = meshgrid(linspace(0,1,100));
keepind = (x + y) <= 1;
x(keepind) = NaN;
y(keepind) = NaN;
f = 1 - .5*x - .7*y;
surf(x,y,f)
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Vikas Sharma
Vikas Sharma 2021-6-11
编辑：Vikas Sharma 2021-6-11
Isn't it should x(~keepind)=NaN and y(~keepind)= NaN

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