CUNG2L man page on Oracle

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cung2l.f(3)			    LAPACK			   cung2l.f(3)

       cung2l.f -

       subroutine cung2l (M, N, K, A, LDA, TAU, WORK, INFO)
	   CUNG2L generates all or part of the unitary matrix Q from a QL
	   factorization determined by cgeqlf (unblocked algorithm).

Function/Subroutine Documentation
   subroutine cung2l (integerM, integerN, integerK, complex, dimension( lda, *
       )A, integerLDA, complex, dimension( * )TAU, complex, dimension( *
       )WORK, integerINFO)
       CUNG2L generates all or part of the unitary matrix Q from a QL
       factorization determined by cgeqlf (unblocked algorithm).


	    CUNG2L 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.


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


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


		     K is INTEGER
		     The number of elementary reflectors whose product defines the
		     matrix Q. N >= K >= 0.


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


		     TAU is COMPLEX array, dimension (K)
		     TAU(i) must contain the scalar factor of the elementary
		     reflector H(i), as returned by CGEQLF.


		     WORK is COMPLEX array, dimension (N)


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

	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

	   September 2012

       Definition at line 115 of file cung2l.f.

       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2			Tue Sep 25 2012			   cung2l.f(3)

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