Extract stiffness matrix finite element matlab

[poster]

I've read MatLab documentatin on how to assemble the stiffness matrix for the finite element approach.
The sintax is

[K,M,F] = assema(p,t,c,a,f) #assembles the matrices from the mesh data in p and t
Here c,a,f are just the cofficients like 0 or 1 and are not of interesent for the purpose of the question.

In this example, p and t are already computed by the command initmesh.

My question is the following: I have a triangulation that has been given to me from an other people, so I already have p and t, and I want to run the assema command. The format is the same of the one of matlab, but I don't understand why it doesn't work. Maybe because it's not generated by the command initmesh ?

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