CGETRS (3) Linux Manual Page

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

 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

 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

 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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