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cgeqrf.f(3)				      LAPACK				      cgeqrf.f(3)

NAME
       cgeqrf.f -

SYNOPSIS
   Functions/Subroutines
       subroutine cgeqrf (M, N, A, LDA, TAU, WORK, LWORK, INFO)
	   CGEQRF

Function/Subroutine Documentation
   subroutine cgeqrf (integerM, integerN, complex, dimension( lda, * )A, integerLDA, complex,
       dimension( * )TAU, complex, dimension( * )WORK, integerLWORK, integerINFO)
       CGEQRF

       Purpose:

	    CGEQRF 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 min(m,n) 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 (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,N).
		     For optimum performance LWORK >= N*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 had an illegal value

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       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 137 of file cgeqrf.f.

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

Version 3.4.2				 Tue Sep 25 2012			      cgeqrf.f(3)
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