org.netlib.lapack
Class DLARRC

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

public class DLARRC
extends java.lang.Object

DLARRC is a simplified interface to the JLAPACK routine dlarrc.
This interface converts Java-style 2D row-major arrays into
the 1D column-major linearized arrays expected by the lower
level JLAPACK routines.  Using this interface also allows you
to omit offset and leading dimension arguments.  However, because
of these conversions, these routines will be slower than the low
level ones.  Following is the description from the original Fortran
source.  Contact seymour@cs.utk.edu with any questions.

* .. * * Purpose * ======= * * Find the number of eigenvalues of the symmetric tridiagonal matrix T * that are in the interval (VL,VU] if JOBT = 'T', and of L D L^T * if JOBT = 'L'. * * Arguments * ========= * * JOBT (input) CHARACTER*1 * = 'T': Compute Sturm count for matrix T. * = 'L': Compute Sturm count for matrix L D L^T. * * N (input) INTEGER * The order of the matrix. N > 0. * * VL (input) DOUBLE PRECISION * VU (input) DOUBLE PRECISION * The lower and upper bounds for the eigenvalues. * * D (input) DOUBLE PRECISION array, dimension (N) * JOBT = 'T': The N diagonal elements of the tridiagonal matrix * JOBT = 'L': The N diagonal elements of the diagonal matrix D. * * E (input) DOUBLE PRECISION array, dimension (N) * JOBT = 'T': The N-1 offdiagonal elements of the matrix T. * JOBT = 'L': The N-1 offdiagonal elements of the matrix L. * * PIVMIN (input) DOUBLE PRECISION * The minimum pivot in the Sturm sequence for T. * * EIGCNT (output) INTEGER * The number of eigenvalues of the symmetric tridiagonal matrix * that are in the interval (VL,VU] * * LCNT (output) INTEGER * RCNT (output) INTEGER * The left and right negcounts of the interval. * * INFO (output) INTEGER * * Further Details * =============== * * Based on contributions by * Beresford Parlett, University of California, Berkeley, USA * Jim Demmel, University of California, Berkeley, USA * Inderjit Dhillon, University of Texas, Austin, USA * Osni Marques, LBNL/NERSC, USA * Christof Voemel, University of California, Berkeley, USA * * ===================================================================== * * .. Parameters ..


Constructor Summary
DLARRC()
           
 
Method Summary
static void DLARRC(java.lang.String jobt, int n, double vl, double vu, double[] d, double[] e, double pivmin, intW eigcnt, intW lcnt, intW rcnt, intW info)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

DLARRC

public DLARRC()
Method Detail

DLARRC

public static void DLARRC(java.lang.String jobt,
                          int n,
                          double vl,
                          double vu,
                          double[] d,
                          double[] e,
                          double pivmin,
                          intW eigcnt,
                          intW lcnt,
                          intW rcnt,
                          intW info)