How to make a 2D pseudocolor (pcolor) plot in triangle shapes instead of a square shape with triangle cordinates data?

Question

Vijay Sagar 2022-10-13

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https://ww2.mathworks.cn/matlabcentral/answers/1825408-how-to-make-a-2d-pseudocolor-pcolor-plot-in-triangle-shapes-instead-of-a-square-shape-with-triangl

回答： Voss 2022-10-13

data1.mat

I have the coordinates of 8 closed triangles that intersect at the same points and third data. How to fill these triangles with third data similar to 2D pcolor figure, i.e., with colour bars ?

load('data1.mat')

plot(a1,b1)

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Answer 1

Voss 2022-10-13

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https://ww2.mathworks.cn/matlabcentral/answers/1825408-how-to-make-a-2d-pseudocolor-pcolor-plot-in-triangle-shapes-instead-of-a-square-shape-with-triangl#answer_1074093

在 MATLAB Online 中打开

data1.mat

load('data1.mat')

x = reshape(a1(1:end-1),3,[])

x = 3×8

0.4500 0.4500 0.4500 0.4500 0.4500 0.4500 0.4500 0.4500 0.9101 1.0037 1.1725 1.1731 1.2391 1.2686 1.2719 1.2698 1.0037 1.1725 1.1731 1.2391 1.2686 1.2719 1.2698 0.7696

y = reshape(b1(1:end-1),3,[])

y = 3×8

0.9272 0.9272 0.9272 0.9272 0.9272 0.9272 0.9272 0.9272 1.0886 1.1161 1.1373 1.1364 0.9762 0.8198 0.6920 0.6851 1.1161 1.1373 1.1364 0.9762 0.8198 0.6920 0.6851 0.5299

patch(x,y,c1)

colorbar

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Answer 2

Bjorn Gustavsson 2022-10-13

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https://ww2.mathworks.cn/matlabcentral/answers/1825408-how-to-make-a-2d-pseudocolor-pcolor-plot-in-triangle-shapes-instead-of-a-square-shape-with-triangl#answer_1074083

在 MATLAB Online 中打开

This sounds like a task for trisurf. Check the help and documentation to that function. If you want the pcolor rather than the surf layout, you achieve that by either setting the inputs to the z-coordinates to zero or simply by setting the view from above:

view(0,90)

HTH