Plot uncontinous surface made by triangles

Hi, I'm doing Finite elements and I need some help to plot a discontinuous surface. So basically I got:

p : a matrix with nodes*2 dimension, it represents the coordinates of each node of the mapping.

t : it's a m*3 matrix. With m representing the number of element. (t[1,:] will give [1 2 6] for instance which contains the number of the nodes of the first triangle. I added a fourth column of 1 to t to use pdesurf.

and finally u, a row vector of n elements with n the number of nodes.

So, I'm trying to use pdesurf(p',t',u) to plot all the triangles by using I actually get something but it's not discontinous..

I might use pdeplot but it doesn't work even if I transpose the parameters, I think it's because of the extent of the data I use. (u must be the same size of t I suppose but how do I change it ? What are the values of u then?)

Thank you for your help

Answer 1

[KSSV]

Read about triplot and trisurf. You may also have a look in the following code:

https://in.mathworks.com/matlabcentral/fileexchange/32719-postprocessing-in-fem