Developer Reference for Intel® oneAPI Math Kernel Library for C

ID 766684
Date 7/13/2023
Public

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Document Table of Contents

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.

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).