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

## Syntax

vsAtan2( n, a, b, y );

vmsAtan2( n, a, b, y, mode );

vdAtan2( n, a, b, y );

vmdAtan2( n, a, b, y, mode );

• 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.

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 vectory 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 -π/2
- + -π/4
X < +0 - -π
X < +0 -0 -π/2
X < +0 +0 -π/2
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/2
X > +0 +0 +π/2
X > +0 + +0
+ - +3*π/4
+ X < +0 +π/2
+ -0 +π/2
+ +0 +π/2
+ X > +0 +π/2
+ + +π/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
Para obtener información más completa sobre las optimizaciones del compilador, consulte nuestro Aviso de optimización.