[ новости /+++ | форум | теги | ]

NAME
     zung2l - generate an m by n complex matrix Q with  orthonor-
     mal columns,

SYNOPSIS
     SUBROUTINE ZUNG2L( M, N, K, A, LDA, TAU, WORK, INFO )

     INTEGER INFO, K, LDA, M, N

     COMPLEX*16 A( LDA, * ), TAU( * ), WORK( * )



     #include <sunperf.h>

     void zung2l(int m, int n, int k, doublecomplex *za, int lda,
               doublecomplex *tau, int *info) ;

PURPOSE
     ZUNG2L generates an m by n complex matrix Q with orthonormal
     columns, which is defined as the last n columns of a product
     of k elementary reflectors of order m

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

     as returned by ZGEQLF.


ARGUMENTS
     M         (input) INTEGER
               The number of rows of the matrix Q. M >= 0.

     N         (input) INTEGER
               The number of columns of the matrix Q. M >=  N  >=
               0.

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

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

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

     TAU       (input) COMPLEX*16 array, dimension (K)
               TAU(i) must contain the scalar factor of the  ele-
               mentary reflector H(i), as returned by ZGEQLF.

     WORK      (workspace) COMPLEX*16 array, dimension (N)

     INFO      (output) INTEGER
               = 0: successful exit
               < 0: if INFO = -i, the i-th argument has an  ille-
               gal value

Партнёры:

Хостинг: