ZPOTF2 - Online Linux Manual Page

Section : 1
Updated : November 2008
Source : LAPACK routine (version 3.2)
Note : LAPACK routine (version 3.2)
NAMEZPOTF2 - computes the Cholesky factorization of a complex Hermitian positive definite matrix A
SYNOPSISSUBROUTINE ZPOTF2(  UPLO, N, A, LDA, INFO )  CHARACTER UPLO  INTEGER INFO, LDA, N  COMPLEX*16 A( LDA, * )
PURPOSEZPOTF2 computes the Cholesky factorization of a complex Hermitian positive definite matrix A. The factorization has the form

   A = U' * U , if UPLO = 'U', or

   A = L * L', 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.
ARGUMENTSUPLO (input) CHARACTER*1  Specifies whether the upper or lower triangular part of the Hermitian matrix A is stored. = 'U': Upper triangular
= 'L': Lower triangular N (input) INTEGER  The order of the matrix A. N >= 0. A (input/output) COMPLEX*16 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'*U or A = L*L'. LDA (input) INTEGER  The leading dimension of the array A. LDA >= max(1,N). INFO (output) 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. 0
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