Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

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

cblas_?roti

Applies Givens rotation to sparse vectors one of which is in compressed form.

Syntax

void
cblas_sroti
(
const
MKL_INT
nz
,
float
*x
,
const
MKL_INT
*indx
,
float
*y
,
const
float
c
,
const
float
s
);
void
cblas_droti
(
const
MKL_INT
nz
,
double
*x
,
const
MKL_INT
*indx
,
double
*y
,
const
double
c
,
const
double
s
);
Include Files
  • mkl.h
Description
The
?roti
 routines apply the Givens rotation to elements of two real vectors,
x
 (in compressed form
nz
,
x
,
indx
) and
y
 (in full storage form):
x[i] = c*x[i] + s*y[indx[i]]
y[indx[i]] = c*y[indx[i]]- s*x[i]
The routines reference only the elements of
y
 whose indices are listed in the array
indx
. The values in
indx
 must be distinct.
Input Parameters
nz
The number of elements in
x
 and
indx
.
x
Array, size at least
nz
.
indx
Specifies the indices for the elements of
x
.
Array, size at least
nz
.
y
Array, size at least max(
indx[i]
).
c
A scalar.
s
A scalar.
Output Parameters
x
 and
y
The updated arrays.

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