org.netlib.lapack
Class Dlaeda

java.lang.Object
  org.netlib.lapack.Dlaeda

public class Dlaeda
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
 *  =======
 *
 *  DLAEDA computes the Z vector corresponding to the merge step in the
 *  CURLVLth step of the merge process with TLVLS steps for the CURPBMth

 *  problem.
 *
 *  Arguments
 *  =========
 *
 *  N      (input) INTEGER
 *         The dimension of the symmetric tridiagonal matrix.  N >= 0.
 *
 *  TLVLS  (input) INTEGER
 *         The total number of merging levels in the overall divide and
 *         conquer tree.
 *
 *  CURLVL (input) INTEGER
 *         The current level in the overall merge routine,
 *         0 <= curlvl <= tlvls.
 *
 *  CURPBM (input) INTEGER
 *         The current problem in the current level in the overall
 *         merge routine (counting from upper left to lower right).
 *
 *  PRMPTR (input) INTEGER array, dimension (N lg N)
 *         Contains a list of pointers which indicate where in PERM a
 *         level's permutation is stored.  PRMPTR(i+1) - PRMPTR(i)
 *         indicates the size of the permutation and incidentally the
 *         size of the full, non-deflated problem.
 *
 *  PERM   (input) INTEGER array, dimension (N lg N)
 *         Contains the permutations (from deflation and sorting) to be
 *         applied to each eigenblock.
 *
 *  GIVPTR (input) INTEGER array, dimension (N lg N)
 *         Contains a list of pointers which indicate where in GIVCOL a
 *         level's Givens rotations are stored.  GIVPTR(i+1) - GIVPTR(i)

 *         indicates the number of Givens rotations.
 *
 *  GIVCOL (input) INTEGER array, dimension (2, N lg N)
 *         Each pair of numbers indicates a pair of columns to take place
 *         in a Givens rotation.
 *
 *  GIVNUM (input) DOUBLE PRECISION array, dimension (2, N lg N)
 *         Each number indicates the S value to be used in the
 *         corresponding Givens rotation.
 *
 *  Q      (input) DOUBLE PRECISION array, dimension (N**2)
 *         Contains the square eigenblocks from previous levels, the
 *         starting positions for blocks are given by QPTR.
 *
 *  QPTR   (input) INTEGER array, dimension (N+2)
 *         Contains a list of pointers which indicate where in Q an
 *         eigenblock is stored.  SQRT( QPTR(i+1) - QPTR(i) ) indicates
 *         the size of the block.
 *
 *  Z      (output) DOUBLE PRECISION array, dimension (N)
 *         On output this vector contains the updating vector (the last
 *         row of the first sub-eigenvector matrix and the first row of
 *         the second sub-eigenvector matrix).
 *
 *  ZTEMP  (workspace) DOUBLE PRECISION array, dimension (N)
 *
 *  INFO   (output) INTEGER
 *          = 0:  successful exit.
 *          < 0:  if INFO = -i, the i-th argument had an illegal value.
 *
 *  Further Details
 *  ===============
 *
 *  Based on contributions by
 *     Jeff Rutter, Computer Science Division, University of California
 *     at Berkeley, USA
 *
 *  =====================================================================
 *
 *     .. Parameters ..

Constructor Summary

Dlaeda()

Method Summary

static void

dlaeda(int n, int tlvls, int curlvl, int curpbm, int[] prmptr, int _prmptr_offset, int[] perm, int _perm_offset, int[] givptr, int _givptr_offset, int[] givcol, int _givcol_offset, double[] givnum, int _givnum_offset, double[] q, int _q_offset, int[] qptr, int _qptr_offset, double[] z, int _z_offset, double[] ztemp, int _ztemp_offset, intW info)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Dlaeda

public Dlaeda()

Method Detail

dlaeda

public static void dlaeda(int n,
                          int tlvls,
                          int curlvl,
                          int curpbm,
                          int[] prmptr,
                          int _prmptr_offset,
                          int[] perm,
                          int _perm_offset,
                          int[] givptr,
                          int _givptr_offset,
                          int[] givcol,
                          int _givcol_offset,
                          double[] givnum,
                          int _givnum_offset,
                          double[] q,
                          int _q_offset,
                          int[] qptr,
                          int _qptr_offset,
                          double[] z,
                          int _z_offset,
                          double[] ztemp,
                          int _ztemp_offset,
                          intW info)