dgbtrs man page on IRIX

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DGBTRS(3F)							    DGBTRS(3F)

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

SYNOPSIS
     SUBROUTINE DGBTRS( TRANS, N, KL, KU, NRHS, AB, LDAB, IPIV, B, LDB, INFO )

	 CHARACTER	TRANS

	 INTEGER	INFO, KL, KU, LDAB, LDB, N, NRHS

	 INTEGER	IPIV( * )

	 DOUBLE		PRECISION AB( LDAB, * ), B( LDB, * )

PURPOSE
     DGBTRS solves a system of linear equations
	A * X = B  or  A' * X = B with a general band matrix A using the LU
     factorization computed by DGBTRF.

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.

     KL	     (input) INTEGER
	     The number of subdiagonals within the band of A.  KL >= 0.

     KU	     (input) INTEGER
	     The number of superdiagonals within the band of A.	 KU >= 0.

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

     AB	     (input) DOUBLE PRECISION array, dimension (LDAB,N)
	     Details of the LU factorization of the band matrix A, as computed
	     by DGBTRF.	 U is stored as an upper triangular band matrix with
	     KL+KU superdiagonals in rows 1 to KL+KU+1, and the multipliers
	     used during the factorization are stored in rows KL+KU+2 to
	     2*KL+KU+1.

     LDAB    (input) INTEGER
	     The leading dimension of the array AB.  LDAB >= 2*KL+KU+1.

									Page 1

DGBTRS(3F)							    DGBTRS(3F)

     IPIV    (input) INTEGER array, dimension (N)
	     The pivot indices; 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

									Page 2

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