SRC/dgstrsL.c File Reference

Performs the L-solve using the LU factorization computed by DGSTRF. More...

#include "slu_ddefs.h"
#include "slu_util.h"

Functions

void dusolve (int, int, double *, double *)
 Solves a dense upper triangular system.
void dlsolve (int, int, double *, double *)
 Solves a dense UNIT lower triangular system.
void dmatvec (int, int, int, double *, double *, double *)
 Performs a dense matrix-vector multiply: Mxvec = Mxvec + M * vec.
void dgstrsL (char *trans, SuperMatrix *L, int *perm_r, SuperMatrix *B, int *info)
void dprint_soln (int n, int nrhs, double *soln)


Detailed Description

 -- SuperLU routine (version 2.0) --
 Univ. of California Berkeley, Xerox Palo Alto Research Center,
 and Lawrence Berkeley National Lab.
 September 15, 2003

 Copyright (c) 1994 by Xerox Corporation.  All rights reserved.

 THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY
 EXPRESSED OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.

 Permission is hereby granted to use or copy this program for any
 purpose, provided the above notices are retained on all copies.
 Permission to modify the code and to distribute modified code is
 granted, provided the above notices are retained, and a notice that
 the code was modified is included with the above copyright notice.
 

Function Documentation

void dgstrsL ( char *  trans,
SuperMatrix L,
int *  perm_r,
SuperMatrix B,
int *  info 
)

 Purpose
 =======

 dgstrsL only performs the L-solve using the LU factorization computed
 by DGSTRF.

 See supermatrix.h for the definition of 'SuperMatrix' structure.

 Arguments
 =========

 trans   (input) char*
          Specifies the form of the system of equations:
          = 'N':  A * X = B  (No transpose)
          = 'T':  A'* X = B  (Transpose)
          = 'C':  A**H * X = B  (Conjugate transpose)

 L       (input) SuperMatrix*
         The factor L from the factorization Pr*A*Pc=L*U as computed by
         dgstrf(). Use compressed row subscripts storage for supernodes,
         i.e., L has types: Stype = SLU_SC, Dtype = SLU_D, Mtype = SLU_TRLU.

 U       (input) SuperMatrix*
         The factor U from the factorization Pr*A*Pc=L*U as computed by
         dgstrf(). Use column-wise storage scheme, i.e., U has types:
         Stype = SLU_NC, Dtype = SLU_D, Mtype = SLU_TRU.

 perm_r  (input) int*, dimension (L->nrow)
         Row permutation vector, which defines the permutation matrix Pr; 
         perm_r[i] = j means row i of A is in position j in Pr*A.

 B       (input/output) SuperMatrix*
         B has types: Stype = SLU_DN, Dtype = SLU_D, Mtype = SLU_GE.
         On entry, the right hand side matrix.
         On exit, the solution matrix if info = 0;

 info    (output) int*
 	   = 0: successful exit
	   < 0: if info = -i, the i-th argument had an illegal value
 

void dlsolve ( int  ldm,
int  ncol,
double *  M,
double *  rhs 
)

The unit lower triangular matrix is stored in a 2D array M(1:nrow,1:ncol). The solution will be returned in the rhs vector.

void dmatvec ( int  ldm,
int  nrow,
int  ncol,
double *  M,
double *  vec,
double *  Mxvec 
)

The input matrix is M(1:nrow,1:ncol); The product is returned in Mxvec[].

void dprint_soln ( int  n,
int  nrhs,
double *  soln 
)

void dusolve ( int  ldm,
int  ncol,
double *  M,
double *  rhs 
)

The upper triangular matrix is stored in a 2-dim array M(1:ldm,1:ncol). The solution will be returned in the rhs vector.


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