man clauum (Fonctions bibliothèques) - 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

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 factor 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 triangle 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