Developer Reference for Intel® oneAPI Math Kernel Library for C
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v?Atanpi
Computes the inverse tangent of vector elements divided by π.
Syntax
vsAtanpi (n, a, y);
vsAtanpiI(n, a, inca, y, incy);
vmsAtanpi (n, a, y, mode);
vmsAtanpiI(n, a, inca, y, incy, mode);
vdAtanpi (n, a, y);
vdAtanpiI(n, a, inca, y, incy);
vmdAtanpi (n, a, y, mode);
vmdAtanpiI(n, a, inca, 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 |
const float* for vsAtanpi const float* for vmsAtanpi const double* for vdAtanpi const double* for vmdAtanpi |
Pointer to the array containing the input vector a. |
inca, incy |
const MKL_INT |
Specifies increments for the elements of a 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 vsAtanpi float* for vmsAtanpi double* for vdAtanpi double* for vmdAtanpi |
Pointer to an array containing the output vector y. |
Description
The v?Atanpi function computes the inverse tangent of vector elements divided by π. For an argument x, the function computes atan(x)/π.
Argument | Result | VM Error Status | Exception |
---|---|---|---|
+0 | +0 | ||
-0 | -0 | ||
+∞ | +1/2 | ||
-∞ | -1/2 | ||
QNAN | QNAN | ||
SNAN | QNAN | INVALID |