v?Atan2pi
v?Atan2pi
Computes the four-quadrant inverse tangent of the ratios of the corresponding elements of two vectors divided by
π
.Syntax
vsAtan2pi
(
n
,
a
,
b
,
y
);
vsAtan2piI(n, a, inca, b, incb, y, incy);
vmsAtan2pi
(
n
,
a
,
b
,
y
,
mode
);
vmsAtan2piI(n, a, inca, b, incb, y, incy, mode);
vdAtan2pi
(
n
,
a
,
b
,
y
);
vdAtan2piI(n, a, inca, b, incb, y, incy);
vmdAtan2pi
(
n
,
a
,
b
,
y
,
mode
);
vmdAtan2piI(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 vsAtan2pi const float* for vmsAtan2pi const double* for vdAtan2pi const double* for vmdAtan2pi | Pointers to the arrays containing 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 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 vsAtan2pi float* for vmsAtan2pi double* for vdAtan2pi double* for vmdAtan2pi | Pointer to an array containing the output vector y . |
Description
The
v?Atan2pi
function computes the four-quadrant inverse tangent of the ratios of the corresponding elements of two vectors divided by π
. For the elements of the output vector /, with the result divided by
y
, the function computers the four-quadrant arctangent of a
i
b
i
π
.Argument 1 | Argument 2 | Result | Exception |
|---|---|---|---|
- ∞ | - ∞ | -3/4 | |
- ∞ | x < +0 | -1/2 | |
- ∞ | -0 | +1/2 | |
- ∞ | +0 | -1/2 | |
- ∞ | x > +0 | -1/2 | |
- ∞ | + ∞ | -1/4 | |
x < +0 | - ∞ | -1 | |
x < +0 | -0 | -1/2 | |
x < +0 | +0 | -1/2 | |
x < +0 | + ∞ | -0 | |
-0 | - ∞ | -1 | |
-0 | x < +0 | -1 | |
-0 | -0 | -1 | |
-0 | +0 | -0 | |
-0 | x > +0 | -0 | |
-0 | + ∞ | -0 | |
+0 | - ∞ | +1 | |
+0 | x < +0 | +1 | |
+0 | -0 | +1 | |
+0 | +0 | +0 | |
+0 | x > +0 | +0 | |
+0 | + ∞ | +0 | |
x > +0 | - ∞ | +1 | |
x > +0 | -0 | +1/2 | |
x > +0 | +0 | +1/2 | |
x > +0 | + ∞ | +1/4 | |
+ ∞ | - ∞ | +3/4 | |
+ ∞ | x < +0 | +1/2 | |
+ ∞ | -0 | +1/2 | |
+ ∞ | +0 | +1/2 | |
+ ∞ | x > +0 | +1/2 | |
+ ∞ | + ∞ | +1/4 | |
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 |