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RedHat 9 (Linux i386) - man page for sgesc2 (redhat section l)

SGESC2(l)					)					SGESC2(l)

NAME
       SGESC2  -  solve  a  system of linear equations	A * X = scale* RHS  with a general N-by-N
       matrix A using the LU factorization with complete pivoting computed by SGETC2

SYNOPSIS
       SUBROUTINE SGESC2( N, A, LDA, RHS, IPIV, JPIV, SCALE )

	   INTEGER	  LDA, N

	   REAL 	  SCALE

	   INTEGER	  IPIV( * ), JPIV( * )

	   REAL 	  A( LDA, * ), RHS( * )

PURPOSE
       SGESC2 solves a system of linear equations A * X = scale* RHS with a general N-by-N matrix
       A using the LU factorization with complete pivoting computed by SGETC2.

ARGUMENTS
       N       (input) INTEGER
	       The order of the matrix A.

       A       (input) REAL array, dimension (LDA,N)
	       On  entry,  the	 LU  part of the factorization of the n-by-n matrix A computed by
	       SGETC2:	A = P * L * U * Q

       LDA     (input) INTEGER
	       The leading dimension of the array A.  LDA >= max(1, N).

       RHS     (input/output) REAL array, dimension (N).
	       On entry, the right hand side vector b.	On exit, the solution vector X.

       IPIV    (iput) INTEGER array, dimension (N).
	       The pivot indices; for 1 <= i <= N, row i of the matrix has been interchanged with
	       row IPIV(i).

       JPIV    (iput) INTEGER array, dimension (N).
	       The  pivot  indices; for 1 <= j <= N, column j of the matrix has been interchanged
	       with column JPIV(j).

       SCALE	(output) REAL
		On exit, SCALE contains the scale factor. SCALE is chosen 0 <= SCALE <= 1 to pre-
		vent owerflow in the solution.

FURTHER DETAILS
       Based on contributions by
	  Bo Kagstrom and Peter Poromaa, Department of Computing Science,
	  Umea University, S-901 87 Umea, Sweden.

LAPACK version 3.0			   15 June 2000 				SGESC2(l)


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