Home Man
Search
Today's Posts
Register

Linux & Unix Commands - Search Man Pages

CentOS 7.0 - man page for cungql.f (centos section 3)

cungql.f(3)				      LAPACK				      cungql.f(3)

NAME
       cungql.f -

SYNOPSIS
   Functions/Subroutines
       subroutine cungql (M, N, K, A, LDA, TAU, WORK, LWORK, INFO)
	   CUNGQL

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

       Purpose:

	    CUNGQL generates an M-by-N complex matrix Q with orthonormal columns,
	    which is defined as the last N columns of a product of K elementary
	    reflectors of order M

		  Q  =	H(k) . . . H(2) H(1)

	    as returned by CGEQLF.

       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 COMPLEX array, dimension (LDA,N)
		     On entry, the (n-k+i)-th column must contain the vector which
		     defines the elementary reflector H(i), for i = 1,2,...,k, as
		     returned by CGEQLF in the last 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 COMPLEX array, dimension (K)
		     TAU(i) must contain the scalar factor of the elementary
		     reflector H(i), as returned by CGEQLF.

	   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 has an illegal value

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Definition at line 129 of file cungql.f.

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

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


All times are GMT -4. The time now is 05:45 AM.

Unix & Linux Forums Content Copyrightę1993-2018. All Rights Reserved.
UNIX.COM Login
Username:
Password:  
Show Password