Developer Reference

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

v?Atanpi

Computes the inverse tangent of vector elements divided by
π
.

Syntax

call vsatanpi
(
n
,
a
,
y
)
call vsatanpii(n, a, inca, y, incy)
call vmsatanpi
(
n
,
a
,
y
,
mode
)
call vmsatanpii(n, a, inca, y, incy, mode)
call vdatanpi
(
n
,
a
,
y
)
call vdatanpii(n, a, inca, y, incy)
call vmdatanpi
(
n
,
a
,
y
,
mode
)
call vmdatanpii(n, a, inca, y, incy, mode)
Include Files
  • mkl_vml.f90
Input Parameters
Name
Type
Description
n
INTEGER
Specifies the number of elements to be calculated.
a
REAL
for
vsatanpi
REAL
for
vmsatanpi
DOUBLE PRECISION
for
vdatanpi
DOUBLE PRECISION
for
vmdatanpi
Pointer to the array containing the input vector
a
.
inca
,
incy
INTEGER, INTENT(IN)
Specifies increments for the elements of
a
and
y
.
mode
INTEGER (KIND=8)
Overrides the global VM
mode
setting for this function call. See
vmlSetMode
for possible values and their description.
Output Parameters
Name
Type
Description
y
REAL
for
vsatanpi
REAL
for
vmsatanpi
DOUBLE PRECISION
for
vdatanpi
DOUBLE PRECISION
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