Developer Reference

Contents

p?lawil

Forms the Wilkinson transform.

Syntax

void
pslawil
(
const
MKL_INT
*
ii
,
const
MKL_INT
*
jj
,
const
MKL_INT
*
m
,
const
float
*
a
,
const
MKL_INT
*
desca
,
const
float
*
h44
,
const
float
*
h33
,
const
float
*
h43h34
,
float
*
v
);
void
pdlawil
(
const
MKL_INT
*
ii
,
const
MKL_INT
*
jj
,
const
MKL_INT
*
m
,
const
double
*
a
,
const
MKL_INT
*
desca
,
const
double
*
h44
,
const
double
*
h33
,
const
double
*
h43h34
,
double
*
v
);
void
pclawil
(
const
MKL_INT
*
ii
,
const
MKL_INT
*
jj
,
const
MKL_INT
*
m
,
const
MKL_Complex8
*
a
,
const
MKL_INT
*
desca
,
const
MKL_Complex8
*
h44
,
const
MKL_Complex8
*
h33
,
const
MKL_Complex8
*
h43h34
,
MKL_Complex8
*
v
);
void
pzlawil
(
const
MKL_INT
*
ii
,
const
MKL_INT
*
jj
,
const
MKL_INT
*
m
,
const
MKL_Complex16
*
a
,
const
MKL_INT
*
desca
,
const
MKL_Complex16
*
h44
,
const
MKL_Complex16
*
h33
,
const
MKL_Complex16
*
h43h34
,
MKL_Complex16
*
v
);
Include Files
  • mkl_scalapack.h
Description
The
p?lawil
function
gets the transform given by
h44
,
h33
, and
h43h34
into
v
starting at row
m
.
Input Parameters
ii
(global)
Number of the process row which owns the matrix element
A
(
m
+2,
m
+2).
jj
(global)
Number of the process column which owns the matrix element
A
(
m
+2,
m
+2).
m
(global)
On entry, the location from where the transform starts (row
m
). Unchanged on exit.
a
(local)
Array of size
lld_a
*
LOCc
(
n_a
)
.
On entry, the Hessenberg matrix. Unchanged on exit.
desca
(global and local)
Array of size
dlen_
. The array descriptor for the distributed matrix
A
. Unchanged on exit.
h44
,
h33
,
h43h34
(global)
These three values are for the double shift
QR
iteration. Unchanged on exit.
Output Parameters
v
(global)
Array of size 3 that contains the transform on output.

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.