v?Ln

Developer Reference for Intel® oneAPI Math Kernel Library for C

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ID 766684

Date 4/28/2026

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v?Ln

vsLn vmsLn vdLn vmdLn vcLn vmcLn vzLn vmzLn Computes natural logarithm of vector elements.

Syntax

vhLn ( n , a , y ) ;

vhLnI(n, a, inca, y, incy);

vmhLn ( n , a , y , mode ) ;

vmhLnI(n, a, inca, y, incy, mode);

vsLn ( n , a , y ) ;

vsLnI(n, a, inca, y, incy);

vmsLn ( n , a , y , mode ) ;

vmsLnI(n, a, inca, y, incy, mode);

vdLn ( n , a , y ) ;

vdLnI(n, a, inca, y, incy);

vmdLn ( n , a , y , mode ) ;

vmdLnI(n, a, inca, y, incy, mode);

vcLn ( n , a , y ) ;

vcLnI(n, a, inca, y, incy);

vmcLn ( n , a , y , mode ) ;

vmcLnI(n, a, inca, y, incy, mode);

vzLn ( n , a , y ) ;

vzLnI(n, a, inca, y, incy);

vmzLn ( n , a , y , mode ) ;

vmzLnI(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 `vhLn` , `vmhLn` const float* for `vsLn` , `vmsLn` const double* for `vdLn` , `vmdLn` const MKL_Complex8* for `vcLn` , `vmcLn` const MKL_Complex16* for `vzLn` , `vmzLn`	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 `vhLn` , `vmhLn` float* for `vsLn` , `vmsLn` double* for `vdLn` , `vmdLn` MKL_Complex8* for `vcLn` , `vmcLn` MKL_Complex16* for `vzLn` , `vmzLn`	Pointer to an array that contains the output vector `y` .

Description

The v?Ln function computes natural logarithm of vector elements.

Special Values for Real Function v?Ln(x)

Argument	Result	VM Error Status	Exception
+1	+0
X < +0	QNAN	VML_STATUS_ERRDOM	INVALID
+0	∞	VML_STATUS_SING	ZERODIVIDE
-0	∞	VML_STATUS_SING	ZERODIVIDE
∞	QNAN	VML_STATUS_ERRDOM	INVALID
∞	∞
QNAN	QNAN
SNAN	QNAN		INVALID

See Special Value Notations for the conventions used in the table below.

Special Values for Complex Function v?Ln(z)

RE(z) i · IM(z)	∞	-X	-0	+0	+X	∞	NAN
+i · ∞		∞ +i · `π` /2	∞ +i · `π` /2	∞ +i · `π` /2	∞ +i · `π` /2	∞ +i · `π` /4	∞ +i · QNAN
+i · Y	∞ +i · `π`					∞ +i · 0	QNAN+i · QNAN INVALID
+i · 0	∞ +i · `π`		∞ +i · `π` ZERODIVIDE	∞ +i · 0 ZERODIVIDE		∞ +i · 0	QNAN+i · QNAN INVALID
-i · 0	∞ -i · `π`		∞ -i · `π` ZERODIVIDE	∞ -i · 0 ZERODIVIDE		∞ -i · 0	QNAN+i · QNAN INVALID
-i · Y	∞ -i · `π`					∞ -i · 0	QNAN+i · QNAN INVALID
-i · ∞		∞ -i · `π` /2	∞ -i · `π` /2	∞ -i · `π` /2	∞ -i · `π` /2	∞ -i · `π` /4	∞ +i · QNAN
+i · NAN	∞ +i · QNAN	QNAN+i · QNAN INVALID	QNAN+i · QNAN INVALID	QNAN+i · QNAN INVALID	QNAN+i · QNAN INVALID	∞ +i · QNAN	QNAN+i · QNAN INVALID

Notes:

raises INVALID exception when real or imaginary part of the argument is SNAN

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Developer Reference for Intel® oneAPI Math Kernel Library for C

v?Ln

Syntax

Include Files

Input Parameters

Output Parameters

Description