pcdbtrs(3) [debian man page]

PCDBTRS(l)						   LAPACK routine (version 1.5) 						PCDBTRS(l)

NAME

       PCDBTRS - solve a system of linear equations   A(1:N, JA:JA+N-1) * X = B(IB:IB+N-1, 1:NRHS)

SYNOPSIS

       SUBROUTINE PCDBTRS( TRANS, N, BWL, BWU, NRHS, A, JA, DESCA, B, IB, DESCB, AF, LAF, WORK, LWORK, INFO )

	   CHARACTER	   TRANS

	   INTEGER	   BWL, BWU, IB, INFO, JA, LAF, LWORK, N, NRHS

	   INTEGER	   DESCA( * ), DESCB( * )

	   COMPLEX	   A( * ), AF( * ), B( * ), WORK( * )

PURPOSE

       PCDBTRS solves a system of linear equations
					 or
		 A(1:N, JA:JA+N-1)' * X = B(IB:IB+N-1, 1:NRHS)

       where A(1:N, JA:JA+N-1) is the matrix used to produce the factors stored in A(1:N,JA:JA+N-1) and AF by PCDBTRF.
       A(1:N, JA:JA+N-1) is an N-by-N complex
       banded diagonally dominant-like distributed
       matrix with bandwidth BWL, BWU.

       Routine PCDBTRF MUST be called first.

LAPACK version 1.5						    12 May 1997 							PCDBTRS(l)

ZGETRS(l)								 )								 ZGETRS(l)

NAME

       ZGETRS - solve a system of linear equations A * X = B, A**T * X = B, or A**H * X = B with a general N-by-N matrix A using the LU factoriza-
       tion computed by ZGETRF

SYNOPSIS

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

	   CHARACTER	  TRANS

	   INTEGER	  INFO, LDA, LDB, N, NRHS

	   INTEGER	  IPIV( * )

	   COMPLEX*16	  A( LDA, * ), B( LDB, * )

PURPOSE

       ZGETRS solves a system of linear equations A * X = B, A**T * X = B, or A**H * X = B with a general N-by-N matrix A using the LU	factoriza-
       tion computed by ZGETRF.

ARGUMENTS

       TRANS   (input) CHARACTER*1
	       Specifies the form of the system of equations:
	       = 'N':  A * X = B     (No transpose)
	       = 'T':  A**T * X = B  (Transpose)
	       = 'C':  A**H * X = B  (Conjugate 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) COMPLEX*16 array, dimension (LDA,N)
	       The factors L and U from the factorization A = P*L*U as computed by ZGETRF.

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

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

       B       (input/output) COMPLEX*16 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 							 ZGETRS(l)