dgemqrt.f(3) [centos man page]

dgemqrt.f(3)							      LAPACK							      dgemqrt.f(3)

NAME

       dgemqrt.f -

SYNOPSIS

   Functions/Subroutines
       subroutine dgemqrt (SIDE, TRANS, M, N, K, NB, V, LDV, T, LDT, C, LDC, WORK, INFO)
	   DGEMQRT

Function/Subroutine Documentation
   subroutine dgemqrt (characterSIDE, characterTRANS, integerM, integerN, integerK, integerNB, double precision, dimension( ldv, * )V, integerLDV,
       double precision, dimension( ldt, * )T, integerLDT, double precision, dimension( ldc, * )C, integerLDC, double precision, dimension( *
       )WORK, integerINFO)
       DGEMQRT

       Purpose:

	    DGEMQRT overwrites the general real M-by-N matrix C with

			    SIDE = 'L'	   SIDE = 'R'
	    TRANS = 'N':      Q C	     C Q
	    TRANS = 'T':   Q**T C	     C Q**T

	    where Q is a real orthogonal matrix defined as the product of K
	    elementary reflectors:

		  Q = H(1) H(2) . . . H(K) = I - V T V**T

	    generated using the compact WY representation as returned by DGEQRT.

	    Q is of order M if SIDE = 'L' and of order N  if SIDE = 'R'.

       Parameters:
	   SIDE

		     SIDE is CHARACTER*1
		     = 'L': apply Q or Q**T from the Left;
		     = 'R': apply Q or Q**T from the Right.

	   TRANS

		     TRANS is CHARACTER*1
		     = 'N':  No transpose, apply Q;
		     = 'C':  Transpose, apply Q**T.

	   M

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

	   N

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

	   K

		     K is INTEGER
		     The number of elementary reflectors whose product defines
		     the matrix Q.
		     If SIDE = 'L', M >= K >= 0;
		     if SIDE = 'R', N >= K >= 0.

	   NB

		     NB is INTEGER
		     The block size used for the storage of T.	K >= NB >= 1.
		     This must be the same value of NB used to generate T
		     in CGEQRT.

	   V

		     V is DOUBLE PRECISION array, dimension (LDV,K)
		     The i-th column must contain the vector which defines the
		     elementary reflector H(i), for i = 1,2,...,k, as returned by
		     CGEQRT in the first K columns of its array argument A.

	   LDV

		     LDV is INTEGER
		     The leading dimension of the array V.
		     If SIDE = 'L', LDA >= max(1,M);
		     if SIDE = 'R', LDA >= max(1,N).

	   T

		     T is DOUBLE PRECISION array, dimension (LDT,K)
		     The upper triangular factors of the block reflectors
		     as returned by CGEQRT, stored as a NB-by-N matrix.

	   LDT

		     LDT is INTEGER
		     The leading dimension of the array T.  LDT >= NB.

	   C

		     C is DOUBLE PRECISION array, dimension (LDC,N)
		     On entry, the M-by-N matrix C.
		     On exit, C is overwritten by Q C, Q**T C, C Q**T or C Q.

	   LDC

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

	   WORK

		     WORK is DOUBLE PRECISION array. The dimension of
		     WORK is N*NB if SIDE = 'L', or  M*NB if SIDE = 'R'.

	   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

       Definition at line 168 of file dgemqrt.f.

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

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