v?Sub

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?Sub

Performs element by element subtraction of vector b from vector a.

Syntax

vsSub( n, a, b, y );

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

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

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

vdSub( n, a, b, y );

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

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

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

vcSub( n, a, b, y );

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

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

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

vzSub( n, a, b, y );

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

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

vmzSubI(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 vsSub, vmsSub const double* for vdSub, vmdSub const MKL_Complex8* for vcSub, vmcSub const MKL_Complex16* for vzSub, vmzSub	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.

Output Parameters

Name	Type	Description
y	float* for vsSub, vmsSub double* for vdSub, vmdSub MKL_Complex8* for vcSub, vmcSub MKL_Complex16* for vzSub, vmzSub	Pointer to an array that contains the output vector y.

Name

Type

Description

float* for vsSub, vmsSub

double* for vdSub, vmdSub

MKL_Complex8* for vcSub, vmcSub

MKL_Complex16* for vzSub, vmzSub

Pointer to an array that contains the output vector y.

Description

The v?Sub function performs element by element subtraction of vector b from vector a.

Special values for Real Function v?Sub(x)
Argument 1	Argument 2	Result	Exception
+0	+0	+0
+0	-0	+0
-0	+0	-0
-0	-0	+0
+∞	+∞	QNAN	INVALID
+∞	-∞	+∞
-∞	+∞	-∞
-∞	-∞	QNAN	INVALID
SNAN	any value	QNAN	INVALID
any value	SNAN	QNAN	INVALID
QNAN	non-SNAN	QNAN
non-SNAN	QNAN	QNAN

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

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

Overflow in a complex function occurs (supported in the HA/LA accuracy modes only) when all RE(x), RE(y), IM(x), IM(y) arguments are finite numbers, but the real or imaginary part of the computed result is so large that it does not fit the target precision. In this case, the function returns ∞ in that part of the result, raises the OVERFLOW exception, and sets the VM Error Status to VML_STATUS_OVERFLOW (overriding any possible VML_STATUS_ACCURACYWARNING status).

Parent topic: Arithmetic Functions

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Developer Reference for Intel® oneAPI Math Kernel Library for C

v?Sub

Syntax

Include Files

Input Parameters

Output Parameters

Description