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

DGETRS(l)					)					DGETRS(l)

NAME
       DGETRS  - solve a system of linear equations A * X = B or A' * X = B with a general N-by-N
       matrix A using the LU factorization computed by DGETRF

SYNOPSIS
       SUBROUTINE DGETRS( TRANS, N, NRHS, A, LDA, IPIV, B, LDB, INFO )

	   CHARACTER	  TRANS

	   INTEGER	  INFO, LDA, LDB, N, NRHS

	   INTEGER	  IPIV( * )

	   DOUBLE	  PRECISION A( LDA, * ), B( LDB, * )

PURPOSE
       DGETRS solves a system of linear equations A * X = B or A' * X = B with a  general  N-by-N
       matrix A using the LU factorization computed by DGETRF.

ARGUMENTS
       TRANS   (input) CHARACTER*1
	       Specifies the form of the system of equations:
	       = 'N':  A * X = B  (No transpose)
	       = 'T':  A'* X = B  (Transpose)
	       = 'C':  A'* X = B  (Conjugate transpose = Transpose)

       N       (input) INTEGER
	       The order of the matrix A.  N >= 0.

       NRHS    (input) INTEGER
	       The number of right hand sides, i.e., the number of columns of the matrix B.  NRHS
	       >= 0.

       A       (input) DOUBLE PRECISION array, dimension (LDA,N)
	       The factors L and U from the factorization A = P*L*U as computed by DGETRF.

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

       IPIV    (input) INTEGER array, dimension (N)
	       The pivot indices from DGETRF; for 1<=i<=N, row i of the matrix	was  interchanged
	       with row IPIV(i).

       B       (input/output) DOUBLE PRECISION array, dimension (LDB,NRHS)
	       On entry, the right hand side matrix B.	On exit, the solution matrix X.

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

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

LAPACK version 3.0			   15 June 2000 				DGETRS(l)


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