clauu2-f(3)

clauu2.f –

Synopsis

Functions/Subroutines

subroutine clauu2 (UPLO, N, A, LDA, INFO)
CLAUU2 computes the product UUH or LHL, where U and L are upper or lower triangular matrices (unblocked algorithm).

Function/Subroutine Documentation

subroutine clauu2 (characterUPLO, integerN, complex, dimension( lda, * )A, integerLDA, integerINFO)

CLAUU2 computes the product UUH or LHL, where U and L are upper or lower triangular matrices (unblocked algorithm).

Purpose:

 CLAUU2 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 unblocked form of the algorithm, calling Level 2 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 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.

Date:

September 2012

Definition at line 103 of file clauu2.f.

Author

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