Developer Reference

  • 2020.2
  • 07/15/2020
  • Public Content
Contents

p?laevswp

Moves the eigenvectors from where they are computed to ScaLAPACK standard block cyclic array.

Syntax

call pslaevswp
(
n
,
zin
,
ldzi
,
z
,
iz
,
jz
,
descz
,
nvs
,
key
,
rwork
,
lrwork
)
call pdlaevswp
(
n
,
zin
,
ldzi
,
z
,
iz
,
jz
,
descz
,
nvs
,
key
,
rwork
,
lrwork
)
call pclaevswp
(
n
,
zin
,
ldzi
,
z
,
iz
,
jz
,
descz
,
nvs
,
key
,
rwork
,
lrwork
)
call pzlaevswp
(
n
,
zin
,
ldzi
,
z
,
iz
,
jz
,
descz
,
nvs
,
key
,
rwork
,
lrwork
)
Description
The
p?laevswp
routine
moves the eigenvectors (potentially unsorted) from where they are computed, to a ScaLAPACK standard block cyclic array, sorted so that the corresponding eigenvalues are sorted.
Input Parameters
np
= the number of rows local to a given process.
nq
= the number of columns local to a given process.
n
(global)
INTEGER
.
The order of the matrix
A
.
n
0.
zin
(local).
REAL
for
pslaevswp
DOUBLE PRECISION
for
pdlaevswp
COMPLEX
for
pclaevswp
COMPLEX*16
for
pzlaevswp
.
Array of size
(
ldzi
,
nvs
(
iam
+2) )
. The eigenvectors on input.
iam
is a process rank from [0,
nprocs
) interval. Each eigenvector resides entirely in one process. Each process holds a contiguous set of
nvs
(
iam
+2)
eigenvectors. The global number of the first eigenvector that the process holds is: ((sum for
i
=[
1,
iam
+1
] of
nvs
(
i
)
)+1).
ldzi
(local)
INTEGER
.
The leading dimension of the
zin
array.
iz
,
jz
(global)
INTEGER
.
The row and column indices in the global matrix
Z
indicating the first row and the first column of the submatrix
Z
, respectively.
descz
(global and local)
INTEGER
Array of size
dlen_
. The array descriptor for the distributed matrix Z.
nvs
(global)
INTEGER
.
Array of size
nprocs
+1
nvs
(
i
) = number of eigenvectors held by processes [0,
i
-1)
nvs
(1) = number of eigenvectors held by processes [0, 1 -1) = 0
nvs
(
nprocs
+1)= number of eigenvectors held by processes [0,
nprocs
)= total number of eigenvectors
.
key
(global)
INTEGER
.
Array of size
n
. Indicates the actual index (after sorting) for each of the eigenvectors.
rwork
(local).
REAL
for
pslaevswp
DOUBLE PRECISION
for
pdlaevswp
COMPLEX
for
pclaevswp
COMPLEX*16
for
pzlaevswp
.
Array of size
lrwork
.
lrwork
(local)
INTEGER
.
Size of
work.
Output Parameters
z
(local).