dgssor (3p)

Name

dgssor - General sparse solver ordering and symbolic factorization.

Synopsis

SUBROUTINE DGSSOR ( ORDMTHD, HANDLE, IER )

CHARACTER*3       ORDMTHD
INTEGER           IER
DOUBLE PRECISION  HANDLE(150)

Description

Oracle Solaris Studio Performance Library                           dgssor(3P)



NAME
       dgssor - General sparse solver ordering and symbolic factorization.

SYNOPSIS
        SUBROUTINE DGSSOR ( ORDMTHD, HANDLE, IER )

        CHARACTER*3       ORDMTHD
        INTEGER           IER
        DOUBLE PRECISION  HANDLE(150)


PURPOSE
       DGSSOR - Orders and symbolically factors a sparse matrix.

PARAMETERS
       ORDMTHD   - CHARACTER*3
               On entry, ORDMTHD specifies the fill-reducing ordering to be
               used by the sparse solver.  Valid options are:

                'nat' or 'NAT' - natural ordering (no ordering)
                'mmd' or 'MMD' - multiple minimum degree (default)
                'gnd' or 'GND' - general nested dissection

               When SuperLU is selected in the initialization routine DGSSIN,
               valid options are:

                'nat' or 'NAT' - natural ordering (no ordering)
                'mmd' or 'MMD' - minimum degree ordering on A'*A (default)
                'spm' or 'SPM' - Minimum degree ordering on A'+A
                'sam' or 'SAM' - Approximate minimum degree column ordering


               In the case of an invalid option, the default method is used.
               A user-specified ordering can be used by calling subroutine
               DGSSUO() in place of DGSSOR().  Unchanged on exit.

       HANDLE(150)  - DOUBLE PRECISION array
               On entry, HANDLE(*) is an array containing information needed
               by the solver, and must be passed unchanged to each sparse
               solver subroutine.  Modified on exit.

       IER       - INTEGER
               Error number.  If no error encountered, unchanged on exit.  If
               error encountered, it is set to a non-zero integer.  Error num-
               bers set by this subroutine:

                -200 : Invalid calling sequence - need to call DGSSIN first.
                -201 : Failure to dynamically allocate memory.
                -202 : Need to call DGSSUO instead of DGSSOR to set user-specified ordering
                -666 : Internal error.




3rd Berkeley Distribution         7 Nov 2015                        dgssor(3P)