systems of linear equations

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Posted by Maciej Janowicz on August 03, 1998 at 12:22:31:

Dear Netlib Users,

Does anybody know of an efficient FORTRAN 77 code
solving systems of linear equations (in complex
numbers) *without the matrix of the system explicitly
given* but with an option to make it possible
to provide a subroutine/function which
calculates entries of this matrix when they are
needed ?
I have a fast but low-memory computer and I cannot
store large matrices.
The system I have to solve contain ~10^3
equations, its matrix is rather full, unfortunately.

Thanks a lot in advance
M. Janowicz

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