Developer Reference

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

cblas_?rotg

Computes the parameters for a Givens rotation.

Syntax

void
cblas_srotg
(
float
*a
,
float
*b
,
float
*c
,
float
*s
);
void
cblas_drotg
(
double
*a
,
double
*b
,
double
*c
,
double
*s
);
void
cblas_crotg
(
void
*a
,
const
void
*b
,
float
*c
,
void
*s
);
void
cblas_zrotg
(
void
*a
,
const
void
*b
,
double
*c
,
void
*s
);
Include Files
  • mkl.h
Description
Given the Cartesian coordinates
(
a
,
b
)
of a point,
these
routines return the parameters
c
,
s
,
r
, and
z
associated with the Givens rotation. The parameters
c
and
s
define a unitary matrix such that:
Equation
The parameter
z
is defined such that if |
a
| > |
b
|,
z
is
s
; otherwise if
c
is not 0
z
is 1/
c
; otherwise
z
is 1.
Input Parameters
a
Provides the
x
-coordinate of the point
p
.
b
Provides the
y
-coordinate of the point
p
.
Output Parameters
a
Contains
the parameter
r
associated with the Givens rotation.
b
Contains
the parameter
z
associated with the Givens rotation.
c
Contains
the parameter
c
associated with the Givens rotation.
s
Contains
the parameter
s
associated with the Givens rotation.

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 reserverd 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