Developer Reference

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

v?Atan

Computes inverse tangent of vector elements.

Syntax

vsAtan
(
n
,
a
,
y
)
;
vsAtanI(n, a, inca, y, incy);
vmsAtan
(
n
,
a
,
y
,
mode
)
;
vmsAtanI(n, a, inca, y, incy, mode);
vdAtan
(
n
,
a
,
y
)
;
vdAtanI(n, a, inca, y, incy);
vmdAtan
(
n
,
a
,
y
,
mode
)
;
vmdAtanI(n, a, inca, y, incy, mode);
vcAtan
(
n
,
a
,
y
)
;
vcAtanI(n, a, inca, y, incy);
vmcAtan
(
n
,
a
,
y
,
mode
)
;
vmcAtanI(n, a, inca, y, incy, mode);
vzAtan
(
n
,
a
,
y
)
;
vzAtanI(n, a, inca, y, incy);
vmzAtan
(
n
,
a
,
y
,
mode
)
;
vmzAtanI(n, a, inca, y, incy, mode);
Include Files
  • mkl.h
Input Parameters
Name
Type
Description
n
const MKL_INT
Specifies the number of elements to be calculated.
a
const float*
for
vsAtan
,
vmsAtan
const double*
for
vdAtan
,
vmdAtan
const MKL_Complex8*
for
vcAtan
,
vmcAtan
const MKL_Complex16*
for
vzAtan
,
vmzAtan
Pointer to an array that contains the input vector
a
.
inca
,
incy
const MKL_INT
Specifies increments for the elements of
a
and
y
.
mode
const MKL_INT64
Overrides global VM mode setting for this function call. See
vmlSetMode
for possible values and their description.
Output Parameters
Name
Type
Description
y
float*
for
vsAtan
,
vmsAtan
double*
for
vdAtan
,
vmdAtan
MKL_Complex8*
for
vcAtan
,
vmcAtan
MKL_Complex16*
for
vzAtan
,
vmzAtan
Pointer to an array that contains the output vector
y
.
Description
The
v?Atan
function computes inverse tangent of vector elements.
Special Values for Real Function
v?Atan(x)
Argument
Result
VM Error Status
Exception
+0
+0
 
 
-0
-0
 
 
+
+
π
/2
 
 
-
-
π
/2
 
 
QNAN
QNAN
 
 
SNAN
QNAN
 
INVALID
Specifications for special values of the complex functions are defined according to the following formula
Atan(z) = -i*Atanh(i*z)
.

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