cpotf2-f(3)

cpotf2.f –

Synopsis

Functions/Subroutines

subroutine cpotf2 (UPLO, N, A, LDA, INFO)
CPOTF2 computes the Cholesky factorization of a symmetric/Hermitian positive definite matrix (unblocked algorithm).

Function/Subroutine Documentation

subroutine cpotf2 (characterUPLO, integerN, complex, dimension( lda, * )A, integerLDA, integerINFO)

CPOTF2 computes the Cholesky factorization of a symmetric/Hermitian positive definite matrix (unblocked algorithm).

Purpose:

 CPOTF2 computes the Cholesky factorization of a complex Hermitian
 positive definite matrix A.
 The factorization has the form
 A = U**H * U , if UPLO = 'U', or
 A = L * L**H, if UPLO = 'L',
 where U is an upper triangular matrix and L is lower triangular.
 This is the unblocked version of the algorithm, calling Level 2 BLAS.

Parameters:

UPLO

 UPLO is CHARACTER*1
 Specifies whether the upper or lower triangular part of the
 Hermitian matrix A is stored.
 = 'U': Upper triangular
 = 'L': Lower triangular

 N is INTEGER
 The order of the matrix A. N >= 0.

 A is COMPLEX array, dimension (LDA,N)
 On entry, the Hermitian matrix A. If UPLO = 'U', the leading
 n by n upper triangular part of A contains the upper
 triangular part of the matrix A, and the strictly lower
 triangular part of A is not referenced. If UPLO = 'L', the
 leading n by n lower triangular part of A contains the lower
 triangular part of the matrix A, and the strictly upper
 triangular part of A is not referenced.
 On exit, if INFO = 0, the factor U or L from the Cholesky
 factorization A = U**H *U or A = L*L**H.

LDA

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

INFO

 INFO is INTEGER
 = 0: successful exit
 < 0: if INFO = -k, the k-th argument had an illegal value
 > 0: if INFO = k, the leading minor of order k is not
 positive definite, and the factorization could not be
 completed.

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

September 2012

Definition at line 110 of file cpotf2.f.

Author

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