ZPOTRF - Online Linux Manual Page

Section : 1
Updated : November 2008
Source : LAPACK routine (version 3.2)
Note : LAPACK routine (version 3.2)
NAMEZPOTRF - computes the Cholesky factorization of a complex Hermitian positive definite matrix A
SYNOPSISSUBROUTINE ZPOTRF(  UPLO, N, A, LDA, INFO )  CHARACTER UPLO  INTEGER INFO, LDA, N  COMPLEX*16 A( LDA, * )
PURPOSEZPOTRF 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 block version of the algorithm, calling Level 3 BLAS.
ARGUMENTSUPLO (input) CHARACTER*1  = 'U': Upper triangle of A is stored;
= 'L': Lower triangle of A is stored. 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**H*U or A = L*L**H. LDA (input) INTEGER  The leading dimension of the array A. LDA >= max(1,N). INFO (output) INTEGER  = 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value
> 0: if INFO = i, the leading minor of order i is not positive definite, and the factorization could not be completed. 0
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