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cgeqr2p.f(3)                        LAPACK                        cgeqr2p.f(3)

NAME
       cgeqr2p.f -

SYNOPSIS
   Functions/Subroutines
       subroutine cgeqr2p (M, N, A, LDA, TAU, WORK, INFO)
           CGEQR2P computes the QR factorization of a general rectangular
           matrix with non-negative diagonal elements using an unblocked
           algorithm.

Function/Subroutine Documentation
   subroutine cgeqr2p (integerM, integerN, complex, dimension( lda, * )A,
       integerLDA, complex, dimension( * )TAU, complex, dimension( * )WORK,
       integerINFO)
       CGEQR2P computes the QR factorization of a general rectangular matrix
       with non-negative diagonal elements using an unblocked algorithm.

       Purpose:

            CGEQR2P computes a QR factorization of a complex m by n matrix A:
            A = Q * R.

       Parameters:
           M

                     M is INTEGER
                     The number of rows of the matrix A.  M >= 0.

           N

                     N is INTEGER
                     The number of columns of the matrix A.  N >= 0.

           A

                     A is COMPLEX array, dimension (LDA,N)
                     On entry, the m by n matrix A.
                     On exit, the elements on and above the diagonal of the array
                     contain the min(m,n) by n upper trapezoidal matrix R (R is
                     upper triangular if m >= n); the elements below the diagonal,
                     with the array TAU, represent the unitary matrix Q as a
                     product of elementary reflectors (see Further Details).

           LDA

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

           TAU

                     TAU is COMPLEX array, dimension (min(M,N))
                     The scalar factors of the elementary reflectors (see Further
                     Details).

           WORK

                     WORK is COMPLEX array, dimension (N)

           INFO

                     INFO is INTEGER
                     = 0: successful exit
                     < 0: if INFO = -i, the i-th argument had an illegal value

       Author:
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Date:
           September 2012

       Further Details:

             The matrix Q is represented as a product of elementary reflectors

                Q = H(1) H(2) . . . H(k), where k = min(m,n).

             Each H(i) has the form

                H(i) = I - tau * v * v**H

             where tau is a complex scalar, and v is a complex vector with
             v(1:i-1) = 0 and v(i) = 1; v(i+1:m) is stored on exit in A(i+1:m,i),
             and tau in TAU(i).

       Definition at line 122 of file cgeqr2p.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2                   Sat Nov 16 2013                   cgeqr2p.f(3)