zlauu2.f

Section: LAPACK (3)
Updated: Tue Nov 14 2017
Page Index
 

NAME

zlauu2.f  

SYNOPSIS


 

Functions/Subroutines


subroutine zlauu2 (UPLO, N, A, LDA, INFO)
ZLAUU2 computes the product UUH or LHL, where U and L are upper or lower triangular matrices (unblocked algorithm).  

Function/Subroutine Documentation

 

subroutine zlauu2 (character UPLO, integer N, complex*16, dimension( lda, * ) A, integer LDA, integer INFO)

ZLAUU2 computes the product UUH or LHL, where U and L are upper or lower triangular matrices (unblocked algorithm).

Purpose:

 ZLAUU2 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*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.

Date:

December 2016

Definition at line 104 of file zlauu2.f.  

Author

Generated automatically by Doxygen for LAPACK from the source code.


 

Index

NAME
SYNOPSIS
Functions/Subroutines
Function/Subroutine Documentation
subroutine zlauu2 (character UPLO, integer N, complex*16, dimension( lda, * ) A, integer LDA, integer INFO)
Author