cgetrs-f(3)

cgetrs.f –

Synopsis

Functions/Subroutines

subroutine cgetrs (TRANS, N, NRHS, A, LDA, IPIV, B, LDB, INFO)
CGETRS

Function/Subroutine Documentation

subroutine cgetrs (characterTRANS, integerN, integerNRHS, complex, dimension( lda, * )A, integerLDA, integer, dimension( * )IPIV, complex, dimension( ldb, * )B, integerLDB, integerINFO)

CGETRS

Purpose:

 CGETRS 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 factorization computed
 by CGETRF.

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**H * X = B (Conjugate 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 COMPLEX array, dimension (LDA,N)
 The factors L and U from the factorization A = P*L*U
 as computed by CGETRF.

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 CGETRF; for 1<=i<=N, row i of the
 matrix was interchanged with row IPIV(i).

 B is COMPLEX 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 cgetrs.f.

Author

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