Access and modify zero matrix coefficient
 

Hi foamers .

I need to access and modify some zero matrix coefficients in order to implement cyclic boundary condition since my matrix is a block matrix and cyclic bc isn't implemented for block matrix in foam-extend 4-0, which is the version of OP that i use. But I dont know how to deal with it.

From the best of my knowledge, the matrix coefficient is stored in lduMatrix with 3 arrays : diag(),upper(),lower() and its still right for blockLduMatrix but it only stores for non-zero coefficient. I'm searching in the source code to find out a way to access the zero-coefficient before modify it. Unfortunately , until now , I still haven't find anything .

Do you guys have any idea about this problem ? Even, a few information might help a lot .

Thanks. Have a nice day !