DSYTRS2 (3) Linux Manual Page

dsytrs2.f –

Synopsis

Functions/Subroutines

subroutine dsytrs2 (UPLO, N, NRHS, A, LDA, IPIV, B, LDB, WORK, INFO)
DSYTRS2

Function/Subroutine Documentation

subroutine dsytrs2 (characterUPLO, integerN, integerNRHS, double precision, dimension( lda, * )A, integerLDA, integer, dimension( * )IPIV, double precision, dimension( ldb, * )B, integerLDB, double precision, dimension( * )WORK, integerINFO)

DSYTRS2

Purpose:

 DSYTRS2 solves a system of linear equations A*X = B with a real

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

 A = L*D*L**T computed by DSYTRF and converted by DSYCONV.

 

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 DOUBLE PRECISION array, dimension (LDA,N)

 The block diagonal matrix D and the multipliers used to

 obtain the factor U or L as computed by DSYTRF.

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 DSYTRF.

B

 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).

WORK

 WORK is REAL 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 dsytrs2.f.

Author

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