Finite Difference Frequency Domain

[la4361]

Hello everybody!
I am trying to construct the FDFD method for 3D structures. I have already constructed the general formulation and specifically I have set the complete matrix form. Due to the fact that the matrices are too sparse, and my system is out of memory, I am trying to set the problem in a dense mode.
To be more specific I want to transform the sparse matrices into dense form and to solve the problem efficiently. I have developed the problem in fortran, so I would like to ask you if anybody knows any library, which I can use in order to achieve this transformation. I know for example that in MATLAB using the sparse() routine I can achieve this goal. Is there any similar routine in fortran?

Thanks in advance!

 

[FredGarvin]

I don't know about the FORTRAN end of things, but depending on what your sparse matrix looks like, I know there are techniques for dealing with them. The first, and only real one that comes to mind, is in the case of a tri-diagonal or an almost tri-diagonal matrix.