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Re: Q: Exponential or inversion of sparse matrices


I am looking for a mathematica fortran or C library corresponding
to my problem, that is concerning operations on sparse matrices.

 	I need help on the calculation of the exponential
 of sparse matrices or at least on the inversion of sparse
 matrices. I am looking for fortran or C library dealing with 
 sparse matrices and that computes the exponential or the inversion.
 
 	Recently I developed a method calculate the exponential 
 of a sparse matrix. I wrote it in a m-file under Matlab. 
 Now that I have validated it under Matlab, I would like to 
 use it on hudge sparse matrix. Matlab is not adapted to this,
 being much too slow and restricted for memory. Therefore I want to
 translate my m-file into a language which can be compiled
 such as C or Fortran. The problem is that my algorithm performs
 the inversion of a sparse matrix and I do not find a routine
 in a fortran or C library to invert a sparse matrix. 
 In the libraries for sparse matrices I have just found routines 
 for the solution of a linear system :
 routine resolving a linear system A.bj=cj, vector bj being the unknown
 and c being a vector of zeros except at row j. Then the result bj
 represents the column j of A^(-1). But you must apply the routine
 a large number of times, the number of column of A... Is it realistic ?
 
         I will be very pleased if you could answer me and help me
 on this subject. Your advice will be welcome.
  
 
 
> > *---------------------------------------------------------------------------*
> > *    Marina Galand                      |                                   *
> > *    CEPHAG - ENSIEG                    |   Tel (33) 76 82 62 66            *
> > *    Rue de la Houille Blanche - BP 46  |   				    *
> > *    38402  Saint Martin d'Heres Cedex  |   Fax (33) 76 82 63 84            *
> > *    FRANCE                             | 				    *
> > *---------------------------------------------------------------------------*
> > 
> 


-- 


*---------------------------------------------------------------------------*
*    Marina Galand                      |                                   *
*    CEPHAG - ENSIEG                    |   Tel (33) 76 82 62 66            *
*    Rue de la Houille Blanche - BP 46  |   				    *
*    38402  Saint Martin d'Heres Cedex  |   Fax (33) 76 82 63 84            *
*    FRANCE                             | 				    *
*---------------------------------------------------------------------------*


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