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Finite Difference Frequency Domain

  1. Jun 17, 2009 #1
    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!
  2. jcsd
  3. Jun 17, 2009 #2


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    Science Advisor

    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.
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