06-03-2008
use the below command:
cat filename | sort | uniq | tail -3
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0
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LEARN ABOUT REDHAT
zlacon
ZLACON(l) ) ZLACON(l)
NAME
ZLACON - estimate the 1-norm of a square, complex matrix A
SYNOPSIS
SUBROUTINE ZLACON( N, V, X, EST, KASE )
INTEGER KASE, N
DOUBLE PRECISION EST
COMPLEX*16 V( N ), X( N )
PURPOSE
ZLACON 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*16 array, dimension (N)
On the final return, V = A*W, where EST = norm(V)/norm(W) (W is not returned).
X (input/output) COMPLEX*16 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 ZLACON must be re-called with all the other parameters unchanged.
EST (output) DOUBLE PRECISION
An estimate (a lower bound) for norm(A).
KASE (input/output) 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' * X. On the final return from ZLACON, 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 ZLACON(l)