Class Slacon

  extended by org.netlib.lapack.Slacon

public class Slacon
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 with any questions.

* .. * * Purpose * ======= * * SLACON 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) REAL array, dimension (N) * On the final return, V = A*W, where EST = norm(V)/norm(W) * (W is not returned). * * X (input/output) REAL array, dimension (N) * On an intermediate return, X should be overwritten by * A * X, if KASE=1, * A' * X, if KASE=2, * and SLACON must be re-called with all the other parameters * unchanged. * * ISGN (workspace) INTEGER array, dimension (N) * * EST (output) REAL * An estimate (a lower bound) for norm(A). * * KASE (input/output) INTEGER * On the initial call to SLACON, 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 SLACON, 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 float altsgn
static float estold
static int i
static int iter
static int j
static int jlast
static int jump
static float temp
Constructor Summary
Method Summary
static void slacon(int n, float[] v, int _v_offset, float[] x, int _x_offset, int[] isgn, int _isgn_offset, floatW est, intW kase)
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail


public static int i


public static int iter


public static int j


public static int jlast


public static int jump


public static float altsgn


public static float estold


public static float temp
Constructor Detail


public Slacon()
Method Detail


public static void slacon(int n,
                          float[] v,
                          int _v_offset,
                          float[] x,
                          int _x_offset,
                          int[] isgn,
                          int _isgn_offset,
                          floatW est,
                          intW kase)