dlauu2 (l) - Linux Manuals

dlauu2: computes the product U * Uaq or Laq * L, where the triangular factor U or L is stored in the upper or lower triangular part of the array A

NAME

DLAUU2 - computes the product U * Uaq or Laq * L, where the triangular factor U or L is stored in the upper or lower triangular part of the array A

SYNOPSIS

SUBROUTINE DLAUU2(
UPLO, N, A, LDA, INFO )

    
CHARACTER UPLO

    
INTEGER INFO, LDA, N

    
DOUBLE PRECISION A( LDA, * )

PURPOSE

DLAUU2 computes the product U * Uaq or Laq * L, where the triangular factor U or L is stored in the upper or lower triangular part of the array A. If UPLO = aqUaq or aquaq then the upper triangle of the result is stored, overwriting the factor U in A.
If UPLO = aqLaq or aqlaq then the lower triangle of the result is stored, overwriting the factor L in A.
This is the unblocked form of the algorithm, calling Level 2 BLAS.

ARGUMENTS

UPLO (input) CHARACTER*1
Specifies whether the triangular factor stored in the array A is upper or lower triangular:
= aqUaq: Upper triangular
= aqLaq: Lower triangular
N (input) INTEGER
The order of the triangular factor U or L. N >= 0.
A (input/output) DOUBLE PRECISION array, dimension (LDA,N)
On entry, the triangular factor U or L. On exit, if UPLO = aqUaq, the upper triangle of A is overwritten with the upper triangle of the product U * Uaq; if UPLO = aqLaq, the lower triangle of A is overwritten with the lower triangle of the product Laq * 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

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