clauum man page on YellowDog

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CLAUUM(l)			       )			     CLAUUM(l)

NAME
       CLAUUM  -  compute  the	product U * U' or L' * L, where the triangular
       factor U or L is stored in the upper or lower triangular	 part  of  the
       array A

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

	   CHARACTER	  UPLO

	   INTEGER	  INFO, LDA, N

	   COMPLEX	  A( LDA, * )

PURPOSE
       CLAUUM computes the product U * U' or L' * L, where the triangular fac‐
       tor U or L is stored in the upper or lower triangular part of the array
       A.   If	UPLO  =	 'U'  or  'u' then the upper triangle of the result is
       stored, overwriting the factor U in A.
       If UPLO = 'L' or 'l' then the lower triangle of the result  is  stored,
       overwriting the factor L in A.

       This is the blocked form of the algorithm, calling Level 3 BLAS.

ARGUMENTS
       UPLO    (input) CHARACTER*1
	       Specifies  whether  the triangular factor stored in the array A
	       is upper or lower triangular:
	       = 'U':  Upper triangular
	       = 'L':  Lower triangular

       N       (input) INTEGER
	       The order of the triangular factor U or L.  N >= 0.

       A       (input/output) COMPLEX array, dimension (LDA,N)
	       On entry, the triangular factor U or L.	On  exit,  if  UPLO  =
	       'U', the upper triangle of A is overwritten with the upper tri‐
	       angle of the product U * U'; if UPLO = 'L', the lower  triangle
	       of A is overwritten with the lower triangle of the product 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

LAPACK version 3.0		 15 June 2000			     CLAUUM(l)
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