OAHM: A Fortran subroutine for solving a class of unsymmetric linear systems of equations. The discretization, by means of the usual 5-point difference formulae, of an elliptic partial differential equation can give rise to an unsymmetric and sparse linear system of equations in which the matrix A of coefficients is an M-matrix such that each element in the upper/lower triangular part is greater than or equal to the respective element in the lower/upper triangular part. In other applications, dense matrices with the same property can arise. A FORTRAN subroutine called OAHM is presented for the solution of such systems which can be easily modified to deal efficiently which the sparse case. The OAHM subroutine uses a regular splitting and the convergence is therefore guaranteed.
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References in zbMATH (referenced in 2 articles , 1 standard article )
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- Ruggiero, V.; Galligani, E.: An iterative method for large sparse linear systems on a vector computer (1990)
- Makinson, G.J.; Shah, A.A.: OAHM: A Fortran subroutine for solving a class of unsymmetric linear systems of equations (1986)