NAME

       cungrq.f -

SYNOPSIS

   Functions/Subroutines
       subroutine cungrq (M, N, K, A, LDA, TAU, WORK, LWORK, INFO)
           CUNGRQ

Function/Subroutine Documentation

   subroutine cungrq (integerM, integerN, integerK, complex, dimension( lda, * )A, integerLDA,
       complex, dimension( * )TAU, complex, dimension( * )WORK, integerLWORK, integerINFO)
       CUNGRQ

       Purpose:

            CUNGRQ generates an M-by-N complex matrix Q with orthonormal rows,
            which is defined as the last M rows of a product of K elementary
            reflectors of order N

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

            as returned by CGERQF.

       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. N >= M.

           K

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

           A

                     A is COMPLEX array, dimension (LDA,N)
                     On entry, the (m-k+i)-th row must contain the vector which
                     defines the elementary reflector H(i), for i = 1,2,...,k, as
                     returned by CGERQF in the last k rows 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 array, dimension (K)
                     TAU(i) must contain the scalar factor of the elementary
                     reflector H(i), as returned by CGERQF.

           WORK

                     WORK is COMPLEX array, dimension (MAX(1,LWORK))
                     On exit, if INFO = 0, WORK(1) returns the optimal LWORK.

           LWORK

                     LWORK is INTEGER
                     The dimension of the array WORK. LWORK >= max(1,M).
                     For optimum performance LWORK >= M*NB, where NB is the
                     optimal blocksize.

                     If LWORK = -1, then a workspace query is assumed; the routine
                     only calculates the optimal size of the WORK array, returns
                     this value as the first entry of the WORK array, and no error
                     message related to LWORK is issued by XERBLA.

           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:
           November 2011

       Definition at line 129 of file cungrq.f.

Author

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