dlauum (l)  Linux Man Pages
dlauum: 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
DLAUUM  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 ASYNOPSIS
 SUBROUTINE DLAUUM(
 UPLO, N, A, LDA, INFO )
 CHARACTER UPLO
 INTEGER INFO, LDA, N
 DOUBLE PRECISION A( LDA, * )
PURPOSE
DLAUUM 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 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:
= 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 kth argument had an illegal value