CPOTF2 man page on IRIX

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CPOTF2(3F)							    CPOTF2(3F)

NAME
     CPOTF2 - compute the Cholesky factorization of a complex Hermitian
     positive definite matrix A

SYNOPSIS
     SUBROUTINE CPOTF2( UPLO, N, A, LDA, INFO )

	 CHARACTER	UPLO

	 INTEGER	INFO, LDA, N

	 COMPLEX	A( LDA, * )

PURPOSE
     CPOTF2 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.

ARGUMENTS
     UPLO    (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 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

									Page 1

CPOTF2(3F)							    CPOTF2(3F)

	     > 0: if INFO = k, the leading minor of order k is not positive
	     definite, and the factorization could not be completed.

									Page 2

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