dlaeda - one modification of the diagonal matrix. Used when the original matrix is dense
SUBROUTINE DLAEDA( N, TLVLS, CURLVL, CURPBM, PRMPTR, PERM, GIVPTR, GIV- COL, 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(*) SUBROUTINE DLAEDA_64( N, TLVLS, CURLVL, CURPBM, PRMPTR, PERM, GIVPTR, GIVCOL, GIVNUM, Q, QPTR, Z, ZTEMP, INFO ) INTEGER*8 CURLVL, CURPBM, INFO, N, TLVLS INTEGER*8 GIVCOL(2,*), GIVPTR(*),PERM(*), PRMPTR(*),QPTR(*) DOUBLE PRECISION GIVNUM(2,*), Q(*),Z(*), ZTEMP(*) F95 INTERFACE SUBROUTINE LAEDA( N, TLVLS, CURLVL, CURPBM, PRMPTR, PERM, GIVPTR, GIV- COL, GIVNUM, Q, QPTR, Z, ZTEMP, INFO ) INTEGER :: N, TLVLS, CURLVL, CURPBM, INFO INTEGER, DIMENSION(:) :: PRMPTR, PERM, GIVPTR, QPTR REAL(8), DIMENSION(:,:) :: GIVNUM REAL(8), DIMENSION(:) :: Q, Z, ZTEMP INTEGER, DIMENSION(:,:) :: GIVCOL SUBROUTINE LAEDA_64( N, TLVLS, CURLVL, CURPBM, PRMPTR, PERM, GIVPTR, GIVCOL, GIVNUM, Q, QPTR, Z, ZTEMP, INFO ) INTEGER(8) :: N, TLVLS, CURLVL, CURPBM, INFO INTEGER(8), DIMENSION(:) :: PRMPTR, PERM, GIVPTR, QPTR REAL(8), DIMENSION(:,:) :: GIVNUM REAL(8), DIMENSION(:) :: Q, Z, ZTEMP INTEGER(8), DIMENSION(:,:) :: GIVCOL C INTERFACE #include <sunperf.h> void dlaeda (int n, int tlvls, int curlvl, int curpbm, int *prmptr, int *perm, int *givptr, int *givcol, double *givnum, double *q, int *qptr, double *z, int *info); void dlaeda_64 (long n, long tlvls, long curlvl, long curpbm, long *prmptr, long *perm, long *givptr, long *givcol, double *givnum, double *q, long *qptr, double *z, long *info);
Oracle Solaris Studio Performance Library dlaeda(3P)
NAME
dlaeda - is used by sstedc. Compute the Z vector determining the rank-
one modification of the diagonal matrix. Used when the original matrix
is dense
SYNOPSIS
SUBROUTINE DLAEDA( N, TLVLS, CURLVL, CURPBM, PRMPTR, PERM, GIVPTR, GIV-
COL, 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(*)
SUBROUTINE DLAEDA_64( N, TLVLS, CURLVL, CURPBM, PRMPTR, PERM, GIVPTR,
GIVCOL, GIVNUM, Q, QPTR, Z, ZTEMP, INFO )
INTEGER*8 CURLVL, CURPBM, INFO, N, TLVLS
INTEGER*8 GIVCOL(2,*), GIVPTR(*),PERM(*), PRMPTR(*),QPTR(*)
DOUBLE PRECISION GIVNUM(2,*), Q(*),Z(*), ZTEMP(*)
F95 INTERFACE
SUBROUTINE LAEDA( N, TLVLS, CURLVL, CURPBM, PRMPTR, PERM, GIVPTR, GIV-
COL, GIVNUM, Q, QPTR, Z, ZTEMP, INFO )
INTEGER :: N, TLVLS, CURLVL, CURPBM, INFO
INTEGER, DIMENSION(:) :: PRMPTR, PERM, GIVPTR, QPTR
REAL(8), DIMENSION(:,:) :: GIVNUM
REAL(8), DIMENSION(:) :: Q, Z, ZTEMP
INTEGER, DIMENSION(:,:) :: GIVCOL
SUBROUTINE LAEDA_64( N, TLVLS, CURLVL, CURPBM, PRMPTR, PERM, GIVPTR,
GIVCOL, GIVNUM, Q, QPTR, Z, ZTEMP, INFO )
INTEGER(8) :: N, TLVLS, CURLVL, CURPBM, INFO
INTEGER(8), DIMENSION(:) :: PRMPTR, PERM, GIVPTR, QPTR
REAL(8), DIMENSION(:,:) :: GIVNUM
REAL(8), DIMENSION(:) :: Q, Z, ZTEMP
INTEGER(8), DIMENSION(:,:) :: GIVCOL
C INTERFACE
#include <sunperf.h>
void dlaeda (int n, int tlvls, int curlvl, int curpbm, int *prmptr, int
*perm, int *givptr, int *givcol, double *givnum, double *q,
int *qptr, double *z, int *info);
void dlaeda_64 (long n, long tlvls, long curlvl, long curpbm, long
*prmptr, long *perm, long *givptr, long *givcol, double
*givnum, double *q, long *qptr, double *z, long *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)
N is INTEGER
The dimension of the symmetric tridiagonal matrix. N >= 0.
TLVLS (input)
TLVLS is INTEGER
The total number of merging levels in the overall divide and
conquer tree.
CURLVL (input)
CURLVL is INTEGER
The current level in the overall merge routine,
0 <= curlvl <= tlvls.
CURPBM (input)
CURPBM is INTEGER
The current problem in the current level in the overall
merge routine (counting from upper left to lower right).
PRMPTR (input)
PRMPTR is 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)
PERM is INTEGER array, dimension (N lg N)
Contains the permutations (from deflation and sorting) to be
applied to each eigenblock.
GIVPTR (input)
GIVPTR is 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)
GIVCOL is 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)
GIVNUM is DOUBLE PRECISION array, dimension (2, N lg N)
Each number indicates the S value to be used in the
corresponding Givens rotation.
Q (input)
Q is DOUBLE PRECISION array, dimension (N**2)
Contains the square eigenblocks from previous levels, the
starting positions for blocks are given by QPTR.
QPTR (input)
QPTR is 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)
Z is 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 (output)
ZTEMP is DOUBLE PRECISION array, dimension (N)
INFO (output)
INFO is INTEGER
= 0: successful exit.
< 0: if INFO = -i, the i-th argument had an illegal value.
7 Nov 2015 dlaeda(3P)