Developer Reference

  • 2020.2
  • 07/15/2020
  • Public Content
Contents

?rot

Applies a plane rotation with real cosine and complex sine to a pair of complex vectors.

Syntax

call crot
(
n
,
cx
,
incx
,
cy
,
incy
,
c
,
s
)
call zrot
(
n
,
cx
,
incx
,
cy
,
incy
,
c
,
s
)
Include Files
  • mkl.fi
Description
The routine applies a plane rotation, where the cosine (
c
) is real and the sine (
s
) is complex, and the vectors
cx
and
cy
are complex. This routine has its real equivalents in BLAS (see
?rot
in Chapter
"BLAS and Sparse BLAS Routines"
).
Input Parameters
n
INTEGER
. The number of elements in the vectors
cx
and
cy
.
cx
,
cy
REAL
for
srot
DOUBLE PRECISION
for
drot
COMPLEX
for
crot
DOUBLE COMPLEX
for
zrot
Arrays of dimension (
n
), contain input vectors
x
and
y
, respectively.
incx
INTEGER
. The increment between successive elements of
cx
.
incy
INTEGER
. The increment between successive elements of
cy
.
c
REAL
for
crot
DOUBLE PRECISION
for
zrot
s
REAL
for
srot
DOUBLE PRECISION
for
drot
COMPLEX
for
crot
DOUBLE COMPLEX
for
zrot
Values that define a rotation
Equation
where
c
*
c
+
s
*conjg(
s
) = 1.0
.
Output Parameters
cx
On exit, overwritten with
c
*
x
+
s
*
y
.
cy
On exit, overwritten with
-conjg(
s
)*
x
+
c
*
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