v?Atan

Developer Reference for Intel® oneAPI Math Kernel Library for C

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ID 766684

Date 10/15/2026

Version

Public

v?Atan

vsAtan vdAtan vcAtan vzAtan vmsAtan vmdAtan vmcAtan vmzAtan Computes inverse tangent of vector elements.

Syntax

vhAtan(n, a, y);
vhAtanI(n, a, inca, y, incy);
vmhAtan(n, a, y, mode);
vmhAtanI(n, a, inca, y, incy, mode);
vsAtan(n, a, y);
vsAtanI(n, a, inca, y, incy);
vmsAtan(n, a, y, mode);
vmsAtanI(n, a, inca, y, incy, mode);
vdAtan(n, a, y);
vdAtanI(n, a, inca, y, incy);
vmdAtan(n, a, y, mode);
vmdAtanI(n, a, inca, y, incy, mode);
vcAtan(n, a, y);
vcAtanI(n, a, inca, y, incy);
vmcAtan(n, a, y, mode);
vmcAtanI(n, a, inca, y, incy, mode);
vzAtan(n, a, y);
vzAtanI(n, a, inca, y, incy);
vmzAtan(n, a, y, mode);
vmzAtanI(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 _Float16* for `vhAtan` , `vmhAtan` const float* for `vsAtan` , `vmsAtan` const double* for `vdAtan` , `vmdAtan` const MKL_Complex8* for `vcAtan` , `vmcAtan` const MKL_Complex16* for `vzAtan` , `vmzAtan`	Pointer to an array that contains the input vector `a` .
`inca` , `incy`	const MKL_INT	Specifies increments for the elements of `a` and `y` .
`mode`	const MKL_INT64	Overrides global VM mode setting for this function call. See vmlSetMode (Sets a new mode for VM functions according to the mode parameter and stores the previous VM mode to oldmode.) for possible values and their description.

Output Parameters

Name	Type	Description
`y`	_Float16* for `vhAtan` , `vmsAtan` float* for `vsAtan` , `vmsAtan` double* for `vdAtan` , `vmdAtan` MKL_Complex8* for `vcAtan` , `vmcAtan` MKL_Complex16* for `vzAtan` , `vmzAtan`	Pointer to an array that contains the output vector `y` .

Description

The v?Atan function computes inverse tangent of vector elements.

Special Values for Real Function v?Atan(x)

Argument	Result	Exception
+0	+0
-0	-0
∞	`π` /2
∞	`π` /2
QNAN	QNAN
SNAN	QNAN	INVALID

Specifications for special values of the complex functions are defined according to the following formula

\(Atan(z) = -i*Atanh(i*z)\) .

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Developer Reference for Intel® oneAPI Math Kernel Library for C

v?Atan

Syntax

Include Files

Input Parameters

Output Parameters

Description