accessing Matrix and ComplexMatrix objects

[John W. Eaton]

On  2-Nov-1998, Michael J Ursiak <address@hidden> wrote:

| I am interfacing a lanczos fortran subroutine with octave and have a 
| question about Matrix and ComplexMatrix objects.  The fortran subroutine
| may will return a Matrix or ComplexMatrix of size m by n, but I it may
| only have m by k (k < n) significant elements which I want to return from
| the wrapper function to the octave environment.  How can I access the
| m by n Matrix (or ComplexMatrix) and copy its elements to a m by k Matrix
| (or ComplexMatrix) to return from the wrapper function to the octave 
| environment.  Thanks.

If I understand the question, something like this should work:

  Matrix M (m, n);

  double *pM = M.fortran_vec;

  F77_FCN (fcn, FCN) (..., pM, ...);

  M.resize (m, k);



jwe