Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

  • 0.10
  • 10/21/2020
  • Public Content
Contents

cblas_?gthrz

Gathers a sparse vector's elements into compressed form, replacing them by zeros.

Syntax

void
cblas_sgthrz
(
const
MKL_INT
nz
,
float
*y
,
float
*x
,
const
MKL_INT
*indx
);
void
cblas_dgthrz
(
const
MKL_INT
nz
,
double
*y
,
double
*x
,
const
MKL_INT
*indx
);
void
cblas_cgthrz
(
const
MKL_INT
nz
,
void
*y
,
void
*x
,
const
MKL_INT
*indx
);
void
cblas_zgthrz
(
const
MKL_INT
nz
,
void
*y
,
void
*x
,
const
MKL_INT
*indx
);
Include Files
  • mkl.h
Description
The
?gthrz
 routines gather the elements with indices specified by the array
indx
 from a full-storage vector
y
 into compressed form (
nz
,
x
,
indx
) and overwrite the gathered elements of
y
 by zeros. Other elements of
y
 are not referenced or modified (see also
?gthr
).
Input Parameters
nz
The number of elements of
y
 to be gathered.
indx
Specifies indices of elements to be gathered.
Array, size at least
nz
.
y
Array, size at least max(
indx
[
i
]
).
Output Parameters
x
Array, size at least
nz
.
Contains the vector converted to the compressed form.
y
The updated vector
y
.

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