All Packages  Class Hierarchy  This Package  Previous  Next  Index

Class org.netlib.lapack.Dlacon

java.lang.Object
   |
   +----org.netlib.lapack.Dlacon

public class Dlacon

extends 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 ..

Dlacon()

dlacon(int, double[], int, double[], int, int[], int, doubleW, intW)

 public 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)

All Packages  Class Hierarchy  This Package  Previous  Next  Index