zlacon.f(3)							      LAPACK							       zlacon.f(3)

NAME

       zlacon.f -

SYNOPSIS

   Functions/Subroutines
       subroutine zlacon (N, V, X, EST, KASE)
	   ZLACON estimates the 1-norm of a square matrix, using reverse communication for evaluating matrix-vector products.

Function/Subroutine Documentation
   subroutine zlacon (integerN, complex*16, dimension( n )V, complex*16, dimension( n )X, double precisionEST, integerKASE)
       ZLACON estimates the 1-norm of a square matrix, using reverse communication for evaluating matrix-vector products.

       Purpose:

	    ZLACON estimates the 1-norm of a square, complex matrix A.
	    Reverse communication is used for evaluating matrix-vector products.

       Parameters:
	   N

		     N is INTEGER
		    The order of the matrix.  N >= 1.

	   V

		     V is COMPLEX*16 array, dimension (N)
		    On the final return, V = A*W,  where  EST = norm(V)/norm(W)
		    (W is not returned).

	   X

		     X is COMPLEX*16 array, dimension (N)
		    On an intermediate return, X should be overwritten by
			  A * X,   if KASE=1,
			  A**H * X,  if KASE=2,
		    where A**H is the conjugate transpose of A, and ZLACON must be
		    re-called with all the other parameters unchanged.

	   EST

		     EST is DOUBLE PRECISION
		    On entry with KASE = 1 or 2 and JUMP = 3, EST should be
		    unchanged from the previous call to ZLACON.
		    On exit, EST is an estimate (a lower bound) for norm(A).

	   KASE

		     KASE is INTEGER
		    On the initial call to ZLACON, KASE should be 0.
		    On an intermediate return, KASE will be 1 or 2, indicating
		    whether X should be overwritten by A * X  or A**H * X.
		    On the final return from ZLACON, KASE will again be 0.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   September 2012

       Further Details:
	   Originally named CONEST, dated March 16, 1988.
	    Last modified: April, 1999

       Contributors:
	   Nick Higham, University of Manchester

       References:
	   N.J. Higham, 'FORTRAN codes for estimating the one-norm of
	     a real or complex matrix, with applications to condition estimation', ACM Trans. Math. Soft., vol. 14, no. 4, pp. 381-396, December
	   1988.

       Definition at line 115 of file zlacon.f.

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

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