Developer Reference

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

v?Atan2

Computes four-quadrant inverse tangent of elements of two vectors.

Syntax

call vsatan2
(
n
,
a
,
b
,
y
)
call vsatan2i(n, a, inca, b, incb, y, incy)
call vmsatan2
(
n
,
a
,
b
,
y
,
mode
)
call vmsatan2i(n, a, inca, b, incb, y, incy, mode)
call vdatan2
(
n
,
a
,
b
,
y
)
call vdatan2i(n, a, inca, b, incb, y, incy)
call vmdatan2
(
n
,
a
,
b
,
y
,
mode
)
call vmdatan2i(n, a, inca, b, incb, y, incy, mode)
Include Files
  • mkl_vml.f90
Input Parameters
Name
Type
Description
n
INTEGER
,
INTENT(IN)
Specifies the number of elements to be calculated.
a
,
b
DOUBLE PRECISION
for
vdatan2
,
vmdatan2
REAL
,
INTENT(IN)
for
vsatan2
,
vmsatan2
DOUBLE PRECISION
,
INTENT(IN)
for
vdatan2
,
vmdatan2
Arrays that specify the input vectors
a
and
b
.
inca
,
incb
,
incy
INTEGER, INTENT(IN)
Specifies increments for the elements of
a
,
b
and
y
.
mode
INTEGER(KIND=8)
,
INTENT(IN)
Overrides global VM mode setting for this function call. See
vmlSetMode
for possible values and their description.
Output Parameters
Name
Type
Description
y
DOUBLE PRECISION
for
vdatan2
,
vmdatan2
REAL
,
INTENT(OUT)
for
vsatan2
,
vmsatan2
DOUBLE PRECISION
,
INTENT(OUT)
for
vdatan2
,
vmdatan2
Array that specifies the output vector
y
.
Description
The
v?Atan2
function computes four-quadrant inverse tangent of elements of two vectors.
The elements of the output vector
y
are computed as the four-quadrant arctangent of
a
[i] /
b
[i]
.
Special values for Real Function
v?Atan2(x)
Argument 1
Argument 2
Result
Exception
-
-
-3*
π
/4
 
-
X < +0
-
π
/2
 
-
-0
-
π
/2
 
-
+0
-
π
/2
 
-
X > +0
-