Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

  • 0.9
  • 09/09/2020
  • Public Content
Contents

p?latra

Computes the trace of a general square distributed matrix.

Syntax

float
pslatra
(
MKL_INT
*n
,
float
*a
,
MKL_INT
*ia
,
MKL_INT
*ja
,
MKL_INT
*desca
);
double
pdlatra
(
MKL_INT
*n
,
double
*a
,
MKL_INT
*ia
,
MKL_INT
*ja
,
MKL_INT
*desca
);
void
pclatra
(
MKL_Complex8
*
,
MKL_INT
*n
,
MKL_Complex8
*a
,
MKL_INT
*ia
,
MKL_INT
*ja
,
MKL_INT
*desca
);
void
pzlatra
(
MKL_Complex16
*
,
MKL_INT
*n
,
MKL_Complex16
*a
,
MKL_INT
*ia
,
MKL_INT
*ja
,
MKL_INT
*desca
);
Include Files
  • mkl_scalapack.h
Description
This function computes the trace of an
n
-by-
n
 distributed matrix sub(
A
) denoting
A
(
ia
:
ia
+
n
-1
,
ja
:
ja
+
n
-1)
. The result is left on every process of the grid.
Input Parameters
n
(global)
The number of rows and columns to be operated on, that is, the order of 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)
 containing the local pieces of the distributed matrix, the trace of which is to be computed.
ia
,
ja
(global) The row and column indices respectively in the global matrix
A
 indicating the first row and the first column of the matrix sub(
A
), respectively.
desca
(global and local) array of size
dlen_
. The array descriptor for the distributed matrix
A
.
Output Parameters
val
The value returned by the function.

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804