cpotrf man page on IRIX

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CPOTRF(3F)							    CPOTRF(3F)

NAME
     CPOTRF - compute the Cholesky factorization of a complex Hermitian
     positive definite matrix A

SYNOPSIS
     SUBROUTINE CPOTRF( UPLO, N, A, LDA, INFO )

	 CHARACTER	UPLO

	 INTEGER	INFO, LDA, N

	 COMPLEX	A( LDA, * )

PURPOSE
     CPOTRF 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.

ARGUMENTS
     UPLO    (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 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

									Page 1

CPOTRF(3F)							    CPOTRF(3F)

	     definite, and the factorization could not be completed.

									Page 2

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