v?Tan

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

Download PDF

ID 766686

Date 4/28/2026

Version

Public

v?Tan

vsTan vdTan vcTan vzTan vmsTan vmdTan vmcTan vmzTan Computes tangent of vector elements.

Syntax

call vstan ( n , a , y )

call vstani(n, a, inca, y, incy)

call vmstan ( n , a , y , mode )

call vmstani(n, a, inca, y, incy, mode)

call vdtan ( n , a , y )

call vdtani(n, a, inca, y, incy)

call vmdtan ( n , a , y , mode )

call vmdtani(n, a, inca, y, incy, mode)

call vctan ( n , a , y )

call vctani(n, a, inca, y, incy)

call vmctan ( n , a , y , mode )

call vmctani(n, a, inca, y, incy, mode)

call vztan ( n , a , y )

call vztani(n, a, inca, y, incy)

call vmztan ( n , a , y , mode )

call vmztani(n, a, inca, 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`	Fortran 77: DOUBLE PRECISION for `vdtan` , `vmdtan`Fortran 77: COMPLEX for `vctan` , `vmctan`Fortran 77: DOUBLE COMPLEX for `vztan` , `vmztan`Fortran 90: REAL , INTENT(IN) for `vstan` , `vmstan`Fortran 90: DOUBLE PRECISION , INTENT(IN) for `vdtan` , `vmdtan`Fortran 90: COMPLEX , INTENT(IN) for `vctan` , `vmctan`Fortran 90: DOUBLE COMPLEX , INTENT(IN) for `vztan` , `vmztan`	Array that specifies the input vector `a` .
`inca` , `incy`	INTEGER, INTENT(IN)	Specifies increments for the elements of `a` and `y` .
`mode`		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`	Fortran 77: DOUBLE PRECISION for `vdtan` , `vmdtan`Fortran 77: COMPLEX for `vctan` , `vmctan`Fortran 77: DOUBLE COMPLEX for `vztan` , `vmztan`Fortran 90: REAL , INTENT(OUT) for `vstan` , `vmstan`Fortran 90: DOUBLE PRECISION , INTENT(OUT) for `vdtan` , `vmdtan`Fortran 90: COMPLEX , INTENT(OUT) for `vctan` , `vmctan`Fortran 90: DOUBLE COMPLEX , INTENT(OUT) for `vztan` , `vmztan`	Array that specifies the output vector `y` .

Description

The v?Tan function computes tangent of vector elements.

Note that arguments abs(a[i]) ≤ 2^{13 } and abs(a[i]) ≤ 2^{16 } for single and double precisions respectively are called fast computational path. These are trigonometric function arguments for which VM provides the best possible performance. Avoid arguments that do not belong to the fast computational path in the VM High Accuracy (HA) and Low Accuracy (LA) functions. Alternatively, you can use VM Enhanced Performance (EP) functions that are fast on the entire function domain. However, these functions provide less accuracy.

Special Values for Real Function v?Tan(x)

Argument	Result	VM Error Status	Exception
+0	+0
-0	-0
∞	QNAN	VML_STATUS_ERRDOM	INVALID
∞	QNAN	VML_STATUS_ERRDOM	INVALID
QNAN	QNAN
SNAN	QNAN		INVALID

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

\(Tan(z) = -i*Tanh(i*z)\) .

Product and Performance Information Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex . Notice revision #20201201

Select Your Language

Using Intel.com Search

Quick Links

Recent Searches

Advanced Search

Only search in

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

v?Tan

Syntax

Include Files

Input Parameters

Output Parameters

Description