UDF's experts !!

S. Ferraris

Hi everybody :

I am working with UDF. I am trying to get the matrix (AMG) coefficient for each equation (Vx,Vy and Pressure correction). I could set the solver in such a way that it does not remove all the information of the matrix (i.e. Ap,reconstruccion vectors,residuals,sources,etc) , but I could not find how to get the offdiagonal elements of the matrix. (I have saw the UDF manual, but nothing appeared). I want to calculated the discretization error, and for that I need the eigenvalues of the inverse matrix, Any there knwons how to do it ?

PD: What this the reconstruction vectors ?

Thank ...a lot.

PD2 : this is a good question. Dont you think ?

Sergio.