Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

  • 2021.1
  • 12/04/2020
  • 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

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