v?Div

Developer Reference for Intel® oneAPI Math Kernel Library for C

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ID 766684

Date 11/07/2023

Version

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v?Div

Performs element by element division of vector a by vector b

Syntax

vsDiv( n, a, b, y );

vsDivI(n, a, inca, b, incb, y, incy);

vmsDiv( n, a, b, y, mode );

vmsDivI(n, a, inca, b, incb, y, incy, mode);

vdDiv( n, a, b, y );

vdDivI(n, a, inca, b, incb, y, incy);

vmdDiv( n, a, b, y, mode );

vmdDivI(n, a, inca, b, incb, y, incy, mode);

vcDiv( n, a, b, y );

vcDivI(n, a, inca, b, incb, y, incy);

vmcDiv( n, a, b, y, mode );

vmcDivI(n, a, inca, b, incb, y, incy, mode);

vzDiv( n, a, b, y );

vzDivI(n, a, inca, b, incb, y, incy);

vmzDiv( n, a, b, y, mode );

vmzDivI(n, a, inca, b, incb, 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, b	const float* for vsDiv, vmsDiv const double* for vdDiv, vmdDiv const MKL_Complex8* for vcDiv, vmcDiv const MKL_Complex16* for vzDiv, vmzDiv	Pointers to arrays that contain the input vectors a and b.
inca, incb, incy	const MKL_INT	Specifies increments for the elements of `a`, `b`, and `y`.
mode	const MKL_INT64	Overrides global VM mode setting for this function call. See vmlSetMode for possible values and their description.

Precision Overflow Thresholds for Real v?Div Function
Data Type	Threshold Limitations on Input Parameters
single precision	`abs(a[i]) < abs(b[i]) * FLT_MAX`
double precision	`abs(a[i]) < abs(b[i]) * DBL_MAX`

Precision overflow thresholds for the complex v?Div function are beyond the scope of this document.

Output Parameters

Name	Type	Description
y	float* for vsDiv, vmsDiv double* for vdDiv, vmdDiv MKL_Complex8* for vcDiv, vmcDiv MKL_Complex16* for vzDiv, vmzDiv	Pointer to an array that contains the output vector y.

Name

Type

Description

float* for vsDiv, vmsDiv

double* for vdDiv, vmdDiv

MKL_Complex8* for vcDiv, vmcDiv

MKL_Complex16* for vzDiv, vmzDiv

Pointer to an array that contains the output vector y.

Description

The v?Div function performs element by element division of vector a by vector b.

Special values for Real Function v?Div(x)
Argument 1	Argument 2	Result	VM Error Status	Exception
X > +0	+0	+∞	VML_STATUS_SING	ZERODIVIDE
X > +0	-0	-∞	VML_STATUS_SING	ZERODIVIDE
X < +0	+0	-∞	VML_STATUS_SING	ZERODIVIDE
X < +0	-0	+∞	VML_STATUS_SING	ZERODIVIDE
+0	+0	QNAN	VML_STATUS_SING
-0	-0	QNAN	VML_STATUS_SING
X > +0	+∞	+0
X > +0	-∞	-0
+∞	+∞	QNAN
-∞	-∞	QNAN
QNAN	QNAN	QNAN
SNAN	SNAN	QNAN		INVALID

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

Div(x1+i*y1,x2+i*y2) = (x1+i*y1)*(x2-i*y2)/(x2*x2+y2*y2).

Overflow in a complex function occurs when x2+i*y2 is not zero, x1, x2, y1, y2 are finite numbers, but the real or imaginary part of the exact result is so large that it does not fit the target precision. In that case, the function returns ∞ in that part of the result, raises the OVERFLOW exception, and sets the VM Error Status to VML_STATUS_OVERFLOW.

Parent topic: Power and Root Functions

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Developer Reference for Intel® oneAPI Math Kernel Library for C

v?Div

Syntax

Include Files

Input Parameters

Output Parameters

Description