cpptrs-f(3)

cpptrs.f –

Synopsis

Functions/Subroutines

subroutine cpptrs (UPLO, N, NRHS, AP, B, LDB, INFO)
CPPTRS

Function/Subroutine Documentation

subroutine cpptrs (characterUPLO, integerN, integerNRHS, complex, dimension( * )AP, complex, dimension( ldb, * )B, integerLDB, integerINFO)

CPPTRS

Purpose:

 CPPTRS solves a system of linear equations A*X = B with a Hermitian
 positive definite matrix A in packed storage using the Cholesky
 factorization A = U**H*U or A = L*L**H computed by CPPTRF.

 

Parameters:

UPLO

 UPLO is CHARACTER*1
 = 'U': Upper triangle of A is stored;
 = 'L': Lower triangle of A is stored.

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 triangular factor U or L from the Cholesky factorization
 A = U**H*U or A = L*L**H, packed columnwise in a linear
 array. The j-th column of U or L is stored in the array AP
 as follows:
 if UPLO = 'U', AP(i + (j-1)*j/2) = U(i,j) for 1<=i<=j;
 if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = L(i,j) for j<=i<=n.

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 109 of file cpptrs.f.

Author

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