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dlaeda (3)
  • >> dlaeda (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         dlaeda - compute the Z vector  corresponding  to  the  merge
         step  in  the  CURLVLth step of the merge process with TLVLS
         steps for the CURPBMth problem
    
    SYNOPSIS
         SUBROUTINE DLAEDA( N, TLVLS, CURLVL, CURPBM,  PRMPTR,  PERM,
                   GIVPTR, GIVCOL, GIVNUM, Q, QPTR, Z, ZTEMP, INFO )
    
         INTEGER CURLVL, CURPBM, INFO, N, TLVLS
    
         INTEGER GIVCOL( 2, * ), GIVPTR( * ), PERM( * ), PRMPTR( * ),
                   QPTR( * )
    
         DOUBLE PRECISION GIVNUM( 2, * ), Q( * ), Z( * ), ZTEMP( * )
    
    
    
         #include <sunperf.h>
    
         void dlaeda(int n, int tlvls, int curlvl,  int  curpbm,  int
                   *prmptr, int *perm, int *givptr, int *givcol, dou-
                   ble *givnum, double *q,  int  *qptr,  double  *dz,
                   double *ztemp, int *info) ;
    
    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 (count-
                   ing 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 lev-
                   els,  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 ille-
                   gal value.
    
    
    
    


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