org.netlib.lapack
Class Slacon
java.lang.Object
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 seymour@cs.utk.edu 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 (input/output) REAL
* On entry with KASE = 1 or 2 and JUMP = 3, EST should be
* unchanged from the previous call to SLACON.
* On exit, EST is 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 ..
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 |
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 float altsgn
estold
public static float estold
temp
public static float temp
Slacon
public Slacon()
slacon
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)