Developer Reference for Intel® oneAPI Math Kernel Library for C

ID 766684
Date 12/16/2022
Public

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Document Table of 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.