zlauum.f3
Usage
Functions/Subroutines
ZLAUUM computes
the
product
UUH
or
LHL,
where
U
and
L
are
upper
or
lower
triangular
matrices
(blocked
algorithm).
Function/Subroutine Documentation
subroutine zlauum (character uplo, integer n, complex*16, dimension( lda, * ) a, integer lda, integer info)
ZLAUUM computes the product UUH or LHL, where U and L are upper or lower triangular matrices (blocked algorithm).
Purpose:
!> !> ZLAUUM computes the product U * U**H or L**H * 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. !>
Parameters
UPLO
!> UPLO is CHARACTER*1 !> Specifies whether the triangular factor stored in the array A !> is upper or lower triangular: !> = 'U': Upper triangular !> = 'L': Lower triangular !>
N
!> N is INTEGER !> The order of the triangular factor U or L. N >= 0. !>
A
!> A is COMPLEX*16 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**H; !> if UPLO = 'L', the lower triangle of A is overwritten with !> the lower triangle of the product L**H * L. !>
LDA
!> LDA is INTEGER !> The leading dimension of the array A. LDA >= max(1,N). !>
INFO
!> INFO is INTEGER !> = 0: successful exit !> < 0: if INFO = -k, the k-th argument had an illegal value !>
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Definition at line 101 of file zlauum.f.
History
- Arch Linux 2026-11-01: the text shown here
- Debian 9 (Stretch)
- Debian 8 (Jessie)
- Debian 7 (Wheezy)