dgetrs-f(3)

dgetrs.f –

Synopsis

Functions/Subroutines

subroutine dgetrs (TRANS, N, NRHS, A, LDA, IPIV, B, LDB, INFO)
DGETRS

Function/Subroutine Documentation

subroutine dgetrs (characterTRANS, integerN, integerNRHS, double precision, dimension( lda, * )A, integerLDA, integer, dimension( * )IPIV, double precision, dimension( ldb, * )B, integerLDB, integerINFO)

DGETRS

Purpose:

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

Parameters:

TRANS

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

 N is INTEGER
 The order of the matrix A. N >= 0.

NRHS

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

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

LDA

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

IPIV

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

LDB

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

INFO

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

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

November 2011

Definition at line 122 of file dgetrs.f.

Author

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