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RedHat 9 (Linux i386) - man page for clacon (redhat section l)

CLACON(l)					)					CLACON(l)

NAME
       CLACON - estimate the 1-norm of a square, complex matrix A

SYNOPSIS
       SUBROUTINE CLACON( N, V, X, EST, KASE )

	   INTEGER	  KASE, N

	   REAL 	  EST

	   COMPLEX	  V( N ), X( N )

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

ARGUMENTS
       N      (input) INTEGER
	      The order of the matrix.	N >= 1.

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

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

       EST    (output) REAL
	      An estimate (a lower bound) for norm(A).

       KASE   (input/output) INTEGER
	      On the initial call to CLACON, 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' * X.  On
	      the final return from CLACON, KASE will again be 0.

FURTHER DETAILS
       Contributed by Nick Higham, University of Manchester.
       Originally named CONEST, dated March 16, 1988.

       Reference: 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.

       Last modified:  April, 1999

LAPACK version 3.0			   15 June 2000 				CLACON(l)


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