clauum.f (3) Linux Manual Page

clauum.f –

Synopsis

Functions/Subroutines

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

Function/Subroutine Documentation

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

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

Purpose:

 CLAUUM 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 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 clauum.f.

Author

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