f04axf

f04axf © Numerical Algorithms Group, 2002.

Purpose

F04AXF Approximate solution of real sparse simultaneous linear equations (coefficient matrix already factorized)

Synopsis

[rhs,resid] = f04axf(a,icn,ikeep,rhs,idisp<,mtype>)

Description

 
                                                     T           
 To solve a system of real linear equations Ax=b or A x=b, where A
 is a general sparse matrix, A must first be factorized by F01BRF 
 or F01BSF. F04AXF then computes x by block forward or backward 
 substitution using simple forward and backward substitution 
 within each diagonal block.

Parameters

f04axf

Required Input Arguments:

a (:)                                 real
icn (:)                               integer
ikeep (:)                             integer
rhs (:)                               real
idisp (2)                             integer

Optional Input Arguments:                       <Default>

mtype                                 integer  1

Output Arguments:

rhs (:)                               real
resid                                 real