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

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Soroush Asarzadeh 2016-4-25

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https://ww2.mathworks.cn/matlabcentral/answers/280880-how-to-plot-a-triangular-shape-function-on-a-triangular-domain

评论： Soroush Asarzadeh 2016-4-27

采纳的回答： Mike Garrity

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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:

[s,t]=meshgrid(0:0.1:1,0:0.1:1)
N3=@(s,t)t.*(2*t-1);
surf(s,t,N3(s,t))

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?

Thanks

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采纳的回答

Mike Garrity 2016-4-25

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/280880-how-to-plot-a-triangular-shape-function-on-a-triangular-domain#answer_219351

I described one approach in this thread.

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Mike Garrity 2016-4-26

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I think that passing a function handle into surf is making things more complicated than you really need.

I don't know what N3 is, but using the N from the top, I get this:

[s,t] = meshgrid(0:0.025:1);
z = t.*(2*t-1);
z(s+t > 1) = nan;
surf(s,t,z)

Soroush Asarzadeh 2016-4-27

Thank you very much Mike!

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