SORGL2 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 SGELQF.

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 REAL 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 SGELQF 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 REAL array, dimension (K)


          TAU(i) must contain the scalar factor of the elementary


          reflector H(i), as returned by SGELQF.

WORK

          WORK is REAL array, dimension (M)

INFO

          INFO is INTEGER


          = 0: successful exit


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

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NAG Ltd.

December 2016