CSYTRS2 (3) Linux Manual Page

csytrs2.f –

Synopsis

Functions/Subroutines

subroutine csytrs2 (UPLO, N, NRHS, A, LDA, IPIV, B, LDB, WORK, INFO)
CSYTRS2

Function/Subroutine Documentation

subroutine csytrs2 (characterUPLO, integerN, integerNRHS, complex, dimension( lda, * )A, integerLDA, integer, dimension( * )IPIV, complex, dimension( ldb, * )B, integerLDB, complex, dimension( * )WORK, integerINFO)

CSYTRS2

Purpose:

 CSYTRS2 solves a system of linear equations A*X = B with a COMPLEX

 symmetric matrix A using the factorization A = U*D*U**T or

 A = L*D*L**T computed by CSYTRF and converted by CSYCONV.

 

Parameters:

UPLO

 UPLO is CHARACTER*1

 Specifies whether the details of the factorization are stored

 as an upper or lower triangular matrix.

 = ‘U’: Upper triangular, form is A = U*D*U**T;

 = ‘L’: Lower triangular, form is A = L*D*L**T.

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 block diagonal matrix D and the multipliers used to

 obtain the factor U or L as computed by CSYTRF.

LDA

 LDA is INTEGER

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

IPIV

 IPIV is INTEGER array, dimension (N)

 Details of the interchanges and the block structure of D

 as determined by CSYTRF.

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).

WORK

 WORK is COMPLEX array, dimension (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 127 of file csytrs2.f.

Author

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