NAME

       dorgl2.f -

SYNOPSIS

   Functions/Subroutines
       subroutine dorgl2 (M, N, K, A, LDA, TAU, WORK, INFO)
           DORGL2

Function/Subroutine Documentation

   subroutine dorgl2 (integer M, integer N, integer K, double precision, dimension( lda, * ) A,
       integer LDA, double precision, dimension( * ) TAU, double precision, dimension( * ) WORK,
       integer INFO)
       DORGL2

       Purpose:

            DORGL2 generates an m by n real matrix Q with orthonormal rows,
            which is defined as the first m rows of a product of k elementary
            reflectors of order n

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

            as returned by DGELQF.

       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 DOUBLE PRECISION array, dimension (LDA,N)
                     On entry, the i-th row must contain the vector which defines
                     the elementary reflector H(i), for i = 1,2,...,k, as returned
                     by DGELQF in the first 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 DOUBLE PRECISION array, dimension (K)
                     TAU(i) must contain the scalar factor of the elementary
                     reflector H(i), as returned by DGELQF.

           WORK

                     WORK is DOUBLE PRECISION array, dimension (M)

           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

Author

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