How to plot a triangular shape function on a triangular domain?

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Hello, I want to plot the following shape function: N(s,t)=t*(2*t-1) It has to look like the following diagramm:
but I get this one:
Here is my code:
I know that the problem is with the rectangular domain, that meshgrid generates. But I don't know how to define a triangular domain. Has anybody an idea?

Accepted Answer

Mike Garrity
Mike Garrity on 25 Apr 2016
I described one approach in this thread.

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