Visible to Intel only — GUID: GUID-1C382C21-47C4-4C89-91BD-EDBE2D733691
Visible to Intel only — GUID: GUID-1C382C21-47C4-4C89-91BD-EDBE2D733691
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 vectory are computed as the four-quadrant arctangent of a[i] / b[i].
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 |