LAPACK  3.4.2
LAPACK: Linear Algebra PACKage
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cpotrf.f File Reference

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Functions/Subroutines

subroutine cpotrf (UPLO, N, A, LDA, INFO)
 CPOTRF VARIANT: right looking block version of the algorithm, calling Level 3 BLAS.

Function/Subroutine Documentation

subroutine cpotrf ( character  UPLO,
integer  N,
complex, dimension( lda, * )  A,
integer  LDA,
integer  INFO 
)

CPOTRF VARIANT: right looking block version of the algorithm, calling Level 3 BLAS.

Purpose:

 CPOTRF computes the Cholesky factorization of a real 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 right looking block version of the algorithm, calling Level 3 BLAS.
Parameters:
[in]UPLO
          UPLO is CHARACTER*1
          = 'U':  Upper triangle of A is stored;
          = 'L':  Lower triangle of A is stored.
[in]N
          N is INTEGER
          The order of the matrix A.  N >= 0.
[in,out]A
          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.
[in]LDA
          LDA is INTEGER
          The leading dimension of the array A.  LDA >= max(1,N).
[out]INFO
          INFO is 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.
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
November 2011

Definition at line 101 of file cpotrf.f.

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