Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

Contents

p?lacp2

Copies all or part of a distributed matrix to another distributed matrix.

Syntax

void
pslacp2
(
char
*uplo
,
MKL_INT
*m
,
MKL_INT
*n
,
float
*a
,
MKL_INT
*ia
,
MKL_INT
*ja
,
MKL_INT
*desca
,
float
*b
,
MKL_INT
*ib
,
MKL_INT
*jb
,
MKL_INT
*descb
);
void
pdlacp2
(
char
*uplo
,
MKL_INT
*m
,
MKL_INT
*n
,
double
*a
,
MKL_INT
*ia
,
MKL_INT
*ja
,
MKL_INT
*desca
,
double
*b
,
MKL_INT
*ib
,
MKL_INT
*jb
,
MKL_INT
*descb
);
void
pclacp2
(
char
*uplo
,
MKL_INT
*m
,
MKL_INT
*n
,
MKL_Complex8
*a
,
MKL_INT
*ia
,
MKL_INT
*ja
,
MKL_INT
*desca
,
MKL_Complex8
*b
,
MKL_INT
*ib
,
MKL_INT
*jb
,
MKL_INT
*descb
);
void
pzlacp2
(
char
*uplo
,
MKL_INT
*m
,
MKL_INT
*n
,
MKL_Complex16
*a
,
MKL_INT
*ia
,
MKL_INT
*ja
,
MKL_INT
*desca
,
MKL_Complex16
*b
,
MKL_INT
*ib
,
MKL_INT
*jb
,
MKL_INT
*descb
);
Include Files
  • mkl_scalapack.h
Description
The
p?lacp2
function
copies all or part of a distributed matrix
A
to another distributed matrix
B
. No communication is performed,
p?lacp2
 performs a local copy sub(
A
):= sub(
B
), where sub(
A
) denotes
A
(
ia
:
ia
+
m
-1
,
a
:
ja
+
n
-1)
 and sub(
B
) denotes
B
(
ib
:
ib
+
m
-1
,
jb
:
jb
+
n
-1)
.
p?lacp2
 requires that only dimension of the matrix operands is distributed.
Input Parameters
uplo
(global) Specifies the part of the distributed matrix sub(
A
) to be copied:
=
'U'
: Upper triangular part is copied; the strictly lower triangular part of sub(
A
) is not referenced;
=
'L'
: Lower triangular part is copied; the strictly upper triangular part of sub(
A
) is not referenced.
Otherwise: all of the matrix sub(
A
) is copied.
m
(global)
The number of rows in the distributed matrix sub(
A
).
(
m
≥
 0)
.
n
(global)
The number of columns in the distributed matrix sub(
A
).
(
n
≥
 0)
.
a
(local).
Pointer into the local memory to an array of size
lld_a
 *
LOCc
(
ja
+
n
-1)
.
On entry, this array contains the local pieces of the
m
-by-
n
 distributed matrix sub(
A
).
ia
,
ja
(global) The row and column indices in the global matrix
A
 indicating the first row and the first column of sub(
A
), respectively.
desca
(global and local) array of size
dlen_
. The array descriptor for the distributed matrix
A
.
ib
,
jb
(global) The row and column indices in the global matrix
B
 indicating the first row and the first column of sub(
B
), respectively.
descb
(global and local) array of size
dlen_
. The array descriptor for the distributed matrix
B
.
Output Parameters
b
(local).
Pointer into the local memory to an array of size
lld_b
 *
LOCc
(
jb
+
n
-1)
. This array contains on exit the local pieces of the distributed matrix sub(
B
 ) set as follows:
if
uplo
 =
'U'
,
B
(
ib
+
i
-1,
jb
+
j
-1) =
A
(
ia
+
i
-1,
ja
+
j
-1), 1≤
i
≤
j
, 1≤
j
≤
n
;
if
uplo
 =
'L'
,
B
(
ib
+
i
-1,
jb
+
j
-1) =
A
(
ia
+
i
-1,
ja
+
j
-1),
j
≤
i
≤
m
, 1≤
j
≤
n
;
otherwise,
B
(
ib
+
i
-1,
jb
+
j
-1) =
A
(
ia
+
i
-1,
ja
+
j
-1), 1≤
i
≤
m
, 1≤
j
≤
n
.

Product and Performance Information

1

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