v?Atan2
v?Atan2
Computes four-quadrant inverse tangent of elements of two vectors.
Syntax
vsAtan2
(
n
,
a
,
b
,
y
)
;
vsAtan2I(n, a, inca, b, incb, y, incy);
vmsAtan2
(
n
,
a
,
b
,
y
,
mode
)
;
vmsAtan2I(n, a, inca, b, incb, y, incy, mode);
vdAtan2
(
n
,
a
,
b
,
y
)
;
vdAtan2I(n, a, inca, b, incb, y, incy);
vmdAtan2
(
n
,
a
,
b
,
y
,
mode
)
;
vmdAtan2I(n, a, inca, b, incb, 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 , b | const float* for vsAtan2 , vmsAtan2 const double* for vdAtan2 , vmdAtan2 | Pointers to arrays that contain the input vectors a and b . |
inca , incb , incy | const MKL_INT | Specifies increments for the elements of a , b 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 vsAtan2 , vmsAtan2 double* for vdAtan2 , vmdAtan2 | Pointer to an array that contains 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]
Argument 1 | Argument 2 | Result | Exception |
---|---|---|---|
- ∞ | - ∞ | -3* π | |
- ∞ | X < +0 | - π | |
- ∞ | -0 | - π | |
- ∞ | +0 | - π | |
- ∞ | X > +0 | - π | |
- ∞ | + ∞ | - π | |
X < +0 | - ∞ | - π | |
X < +0 | -0 | - π | |
X < +0 | +0 | - π | |
X < +0 | + ∞ | -0 | |
-0 | - ∞ | - π | |
-0 | X < +0 | - π | |
-0 | -0 | - π | |
-0 | +0 | -0 | |
-0 | X > +0 | -0 | |
-0 | + ∞ | -0 | |
+0 | - ∞ | + π | |
+0 | X < +0 | + π | |
+0 | -0 | + π | |
+0 | +0 | +0 | |
+0 | X > +0 | +0 | |
+0 | + ∞ | +0 | |
X > +0 | - ∞ | + π | |
X > +0 | -0 | + π | |
X > +0 | +0 | + π | |
X > +0 | + ∞ | +0 | |
+ ∞ | - ∞ | +3* π | |
+ ∞ | X < +0 | + π | |
+ ∞ | -0 | + π | |
+ ∞ | +0 | + π | |
+ ∞ | X > +0 | + π | |
+ ∞ | + ∞ | + π | |
X > +0 | QNAN | QNAN | |
X > +0 | SNAN | QNAN | INVALID |
QNAN | X > +0 | QNAN | |
SNAN | X > +0 | QNAN | INVALID |
QNAN | QNAN | QNAN | |
QNAN | SNAN | QNAN | INVALID |
SNAN | QNAN | QNAN | INVALID |
SNAN | SNAN | QNAN | INVALID |