Generating a square mesh

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Saim Ehtesham
Saim Ehtesham 2022-11-16
编辑： Bruno Luong 2022-11-16
I have found a book that teaches the solution of PDEs and plots the results.
I want to change the plot to a square mesh instead of traingular mesh.
This the code they use:
tri = delaunay(x,y);
trisurf(tri,x,y,u_fem);
which generates something like this:
How do I make sure that the mesh generated does not have those diagonal lines between the squares? and then plot that?
*using MATLAB online
Let me know if the entire code is needed, its in multiple bunches
Thanks
  1 个评论
Bruno Luong
Bruno Luong 2022-11-16
编辑：Bruno Luong 2022-11-16
Finite Elements methods (FEM) must work on triangular mesh, so it must have those diagonals to form set of triangles.
This piece of code show exactly the mesh as it is. This is a good visualization.

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Askic V
Askic V 2022-11-16
Ran in:
If you look at the examples in the Matlab documentation for the mesh function, you can find something like this:
[X,Y] = meshgrid(-5:.5:5);
Z = Y.*sin(X) - X.*cos(Y);
s = mesh(X,Y,Z,'FaceAlpha','0.5');
As you can see this division is not triangular nor does it have diagonals.
  1 个评论
Saim Ehtesham
Saim Ehtesham 2022-11-16
when I am plotting it on a few different functions, I see a horizontal green line mesh at x and y =0 other than the curved lines, how can I fix that?

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