org.netlib.lapack
Class Dlaed9

java.lang.Object
  extended by org.netlib.lapack.Dlaed9

public class Dlaed9
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 * ======= * * DLAED9 finds the roots of the secular equation, as defined by the * values in D, Z, and RHO, between KSTART and KSTOP. It makes the * appropriate calls to DLAED4 and then stores the new matrix of * eigenvectors for use in calculating the next level of Z vectors. * * Arguments * ========= * * K (input) INTEGER * The number of terms in the rational function to be solved by * DLAED4. K >= 0. * * KSTART (input) INTEGER * KSTOP (input) INTEGER * The updated eigenvalues Lambda(I), KSTART <= I <= KSTOP * are to be computed. 1 <= KSTART <= KSTOP <= K. * * N (input) INTEGER * The number of rows and columns in the Q matrix. * N >= K (delation may result in N > K). * * D (output) DOUBLE PRECISION array, dimension (N) * D(I) contains the updated eigenvalues * for KSTART <= I <= KSTOP. * * Q (workspace) DOUBLE PRECISION array, dimension (LDQ,N) * * LDQ (input) INTEGER * The leading dimension of the array Q. LDQ >= max( 1, N ). * * RHO (input) DOUBLE PRECISION * The value of the parameter in the rank one update equation. * RHO >= 0 required. * * DLAMDA (input) DOUBLE PRECISION array, dimension (K) * The first K elements of this array contain the old roots * of the deflated updating problem. These are the poles * of the secular equation. * * W (input) DOUBLE PRECISION array, dimension (K) * The first K elements of this array contain the components * of the deflation-adjusted updating vector. * * S (output) DOUBLE PRECISION array, dimension (LDS, K) * Will contain the eigenvectors of the repaired matrix which * will be stored for subsequent Z vector calculation and * multiplied by the previously accumulated eigenvectors * to update the system. * * LDS (input) INTEGER * The leading dimension of S. LDS >= max( 1, K ). * * INFO (output) INTEGER * = 0: successful exit. * < 0: if INFO = -i, the i-th argument had an illegal value. * > 0: if INFO = 1, an eigenvalue did not converge * * Further Details * =============== * * Based on contributions by * Jeff Rutter, Computer Science Division, University of California * at Berkeley, USA * * ===================================================================== * * .. Local Scalars ..


Constructor Summary
Dlaed9()
           
 
Method Summary
static void dlaed9(int k, int kstart, int kstop, int n, double[] d, int _d_offset, double[] q, int _q_offset, int ldq, double rho, double[] dlamda, int _dlamda_offset, double[] w, int _w_offset, double[] s, int _s_offset, int lds, intW info)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

Dlaed9

public Dlaed9()
Method Detail

dlaed9

public static void dlaed9(int k,
                          int kstart,
                          int kstop,
                          int n,
                          double[] d,
                          int _d_offset,
                          double[] q,
                          int _q_offset,
                          int ldq,
                          double rho,
                          double[] dlamda,
                          int _dlamda_offset,
                          double[] w,
                          int _w_offset,
                          double[] s,
                          int _s_offset,
                          int lds,
                          intW info)