org.netlib.lapack
Class Dlacon
java.lang.Object
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 (input/output) DOUBLE PRECISION
* On entry with KASE = 1 or 2 and JUMP = 3, EST should be
* unchanged from the previous call to DLACON.
* On exit, EST is 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 ..
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 |
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
Dlacon
public Dlacon()
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)