org.netlib.lapack
Class Dlacon

java.lang.Object
  extended by org.netlib.lapack.Dlacon

public class Dlacon
extends java.lang.Object

Following is the description from the original
Fortran source.  For each array argument, the Java
version will include an integer offset parameter, so
the arguments may not match the description exactly.
Contact seymour@cs.utk.edu with any questions.

* .. * * Purpose * ======= * * DLACON estimates the 1-norm of a square, real matrix A. * Reverse communication is used for evaluating matrix-vector products. * * Arguments * ========= * * N (input) INTEGER * The order of the matrix. N >= 1. * * V (workspace) DOUBLE PRECISION array, dimension (N) * On the final return, V = A*W, where EST = norm(V)/norm(W) * (W is not returned). * * X (input/output) DOUBLE PRECISION array, dimension (N) * On an intermediate return, X should be overwritten by * A * X, if KASE=1, * A' * X, if KASE=2, * and DLACON must be re-called with all the other parameters * unchanged. * * ISGN (workspace) INTEGER array, dimension (N) * * EST (output) DOUBLE PRECISION * An estimate (a lower bound) for norm(A). * * KASE (input/output) INTEGER * On the initial call to DLACON, 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 DLACON, KASE will again be 0. * * Further Details * ======= ======= * * Contributed by Nick Higham, University of Manchester. * Originally named SONEST, 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. * * ===================================================================== * * .. Parameters ..


Field Summary
static double altsgn
           
static double estold
           
static int i
           
static int iter
           
static int j
           
static int jlast
           
static int jump
           
static double temp
           
 
Constructor Summary
Dlacon()
           
 
Method Summary
static void dlacon(int n, double[] v, int _v_offset, double[] x, int _x_offset, int[] isgn, int _isgn_offset, doubleW est, intW kase)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

i

public static int i

iter

public static int iter

j

public static int j

jlast

public static int jlast

jump

public static int jump

altsgn

public static double altsgn

estold

public static double estold

temp

public static double temp
Constructor Detail

Dlacon

public Dlacon()
Method Detail

dlacon

public static void dlacon(int n,
                          double[] v,
                          int _v_offset,
                          double[] x,
                          int _x_offset,
                          int[] isgn,
                          int _isgn_offset,
                          doubleW est,
                          intW kase)