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ctrexc.f(3)				      LAPACK				      ctrexc.f(3)

NAME
       ctrexc.f -

SYNOPSIS
   Functions/Subroutines
       subroutine ctrexc (COMPQ, N, T, LDT, Q, LDQ, IFST, ILST, INFO)
	   CTREXC

Function/Subroutine Documentation
   subroutine ctrexc (characterCOMPQ, integerN, complex, dimension( ldt, * )T, integerLDT,
       complex, dimension( ldq, * )Q, integerLDQ, integerIFST, integerILST, integerINFO)
       CTREXC

       Purpose:

	    CTREXC reorders the Schur factorization of a complex matrix
	    A = Q*T*Q**H, so that the diagonal element of T with row index IFST
	    is moved to row ILST.

	    The Schur form T is reordered by a unitary similarity transformation
	    Z**H*T*Z, and optionally the matrix Q of Schur vectors is updated by
	    postmultplying it with Z.

       Parameters:
	   COMPQ

		     COMPQ is CHARACTER*1
		     = 'V':  update the matrix Q of Schur vectors;
		     = 'N':  do not update Q.

	   N

		     N is INTEGER
		     The order of the matrix T. N >= 0.

	   T

		     T is COMPLEX array, dimension (LDT,N)
		     On entry, the upper triangular matrix T.
		     On exit, the reordered upper triangular matrix.

	   LDT

		     LDT is INTEGER
		     The leading dimension of the array T. LDT >= max(1,N).

	   Q

		     Q is COMPLEX array, dimension (LDQ,N)
		     On entry, if COMPQ = 'V', the matrix Q of Schur vectors.
		     On exit, if COMPQ = 'V', Q has been postmultiplied by the
		     unitary transformation matrix Z which reorders T.
		     If COMPQ = 'N', Q is not referenced.

	   LDQ

		     LDQ is INTEGER
		     The leading dimension of the array Q.  LDQ >= max(1,N).

	   IFST

		     IFST is INTEGER

	   ILST

		     ILST is INTEGER

		     Specify the reordering of the diagonal elements of T:
		     The element with row index IFST is moved to row ILST by a
		     sequence of transpositions between adjacent elements.
		     1 <= IFST <= N; 1 <= ILST <= 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:
	   November 2011

       Definition at line 125 of file ctrexc.f.

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

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