Developer Reference

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

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.