extracting FE matrix equation system

Hi people!

I have small issue and I cannot figure out how to solve it. I need your help.

I need to extract my stiffness tensor from the FE matrix system into matlab. I know that there is the function mphmatrix but that extracts all the model and I need just 1 domain in particular.

Have you ever did this? Can you give me a hint on that?

Thanks!

Matias