NAME

       sorg2r.f -

SYNOPSIS

   Functions/Subroutines
       subroutine sorg2r (M, N, K, A, LDA, TAU, WORK, INFO)
           SORG2R generates all or part of the orthogonal matrix Q from a QR factorization
           determined by sgeqrf (unblocked algorithm).

Function/Subroutine Documentation

   subroutine sorg2r (integer M, integer N, integer K, real, dimension( lda, * ) A, integer LDA,
       real, dimension( * ) TAU, real, dimension( * ) WORK, integer INFO)
       SORG2R generates all or part of the orthogonal matrix Q from a QR factorization determined
       by sgeqrf (unblocked algorithm).

       Purpose:

            SORG2R generates an m by n real 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 SGEQRF.

       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 REAL 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 SGEQRF 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 REAL array, dimension (K)
                     TAU(i) must contain the scalar factor of the elementary
                     reflector H(i), as returned by SGEQRF.

           WORK

                     WORK is REAL 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:
           September 2012

Author

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