zung2r.f

Section: LAPACK (3)
Updated: Tue Nov 14 2017
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NAME

zung2r.f  

SYNOPSIS


 

Functions/Subroutines


subroutine zung2r (M, N, K, A, LDA, TAU, WORK, INFO)
ZUNG2R  

Function/Subroutine Documentation

 

subroutine zung2r (integer M, integer N, integer K, complex*16, dimension( lda, * ) A, integer LDA, complex*16, dimension( * ) TAU, complex*16, dimension( * ) WORK, integer INFO)

ZUNG2R

Purpose:

 ZUNG2R generates an m by n complex matrix Q with orthonormal columns,
 which is defined as the first n columns of a product of k elementary
 reflectors of order m

       Q  =  H(1) H(2) . . . H(k)

 as returned by ZGEQRF.


 

Parameters:

M

          M is INTEGER
          The number of rows of the matrix Q. M >= 0.


N

          N is INTEGER
          The number of columns of the matrix Q. M >= N >= 0.


K

          K is INTEGER
          The number of elementary reflectors whose product defines the
          matrix Q. N >= K >= 0.


A

          A is COMPLEX*16 array, dimension (LDA,N)
          On entry, the i-th column must contain the vector which
          defines the elementary reflector H(i), for i = 1,2,...,k, as
          returned by ZGEQRF in the first k columns of its array
          argument A.
          On exit, the m by n matrix Q.


LDA

          LDA is INTEGER
          The first dimension of the array A. LDA >= max(1,M).


TAU

          TAU is COMPLEX*16 array, dimension (K)
          TAU(i) must contain the scalar factor of the elementary
          reflector H(i), as returned by ZGEQRF.


WORK

          WORK is COMPLEX*16 array, dimension (N)


INFO

          INFO is INTEGER
          = 0: successful exit
          < 0: if INFO = -i, the i-th argument has an illegal value


 

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

December 2016

Definition at line 116 of file zung2r.f.  

Author

Generated automatically by Doxygen for LAPACK from the source code.


 

Index

NAME
SYNOPSIS
Functions/Subroutines
Function/Subroutine Documentation
subroutine zung2r (integer M, integer N, integer K, complex*16, dimension( lda, * ) A, integer LDA, complex*16, dimension( * ) TAU, complex*16, dimension( * ) WORK, integer INFO)
Author