Developer Reference

Contents

v?Atanpi

Computes the inverse tangent of vector elements divided by
π
.

Syntax

vsAtanpi
(
n
,
a
,
y
);
vsAtanpiI(n, a, inca, y, incy);
vmsAtanpi
(
n
,
a
,
y
,
mode
);
vmsAtanpiI(n, a, inca, y, incy, mode);
vdAtanpi
(
n
,
a
,
y
);
vdAtanpiI(n, a, inca, y, incy);
vmdAtanpi
(
n
,
a
,
y
,
mode
);
vmdAtanpiI(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
vsAtanpi
const float*
for
vmsAtanpi
const double*
for
vdAtanpi
const double*
for
vmdAtanpi
Pointer to the array containing the input vector
a
.
inca
,
incy
const MKL_INT
Specifies increments for the elements of
a
and
y
.
mode
const MKL_INT64
Overrides the global VM
mode
setting for this function call. See
vmlSetMode
for possible values and their description.
Output Parameters
Name
Type
Description
y
float*
for
vsAtanpi
float*
for
vmsAtanpi
double*
for
vdAtanpi
double*
for
vmdAtanpi
Pointer to an array containing the output vector
y
.
Description
The
v?Atanpi
function computes the inverse tangent of vector elements divided by
π
. For an argument
x
, the function computes atan(
x
)/
π
.
Special values for Real Function
v?Atanpi(x)
Argument
Result
VM Error Status
Exception
+0
+0
-0
-0
+
+1/2
-
-1/2
QNAN
QNAN
SNAN
QNAN
INVALID

Product and Performance Information

1

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