chptrs-f(3)

chptrs.f –

Synopsis

Functions/Subroutines

subroutine chptrs (UPLO, N, NRHS, AP, IPIV, B, LDB, INFO)
CHPTRS

Function/Subroutine Documentation

subroutine chptrs (characterUPLO, integerN, integerNRHS, complex, dimension( * )AP, integer, dimension( * )IPIV, complex, dimension( ldb, * )B, integerLDB, integerINFO)

CHPTRS

Purpose:

 CHPTRS solves a system of linear equations A*X = B with a complex
 Hermitian matrix A stored in packed format using the factorization
 A = U*D*U**H or A = L*D*L**H computed by CHPTRF.

 

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**H;
 = 'L': Lower triangular, form is A = L*D*L**H.

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.

AP

 AP is COMPLEX array, dimension (N*(N+1)/2)
 The block diagonal matrix D and the multipliers used to
 obtain the factor U or L as computed by CHPTRF, stored as a
 packed triangular matrix.

IPIV

 IPIV is INTEGER array, dimension (N)
 Details of the interchanges and the block structure of D
 as determined by CHPTRF.

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 116 of file chptrs.f.

Author

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