Performs element by element division of vector a by vector b

Syntax

vsDiv( n, a, b, y );

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

vdDiv( n, a, b, y );

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

vcDiv( n, a, b, y );

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

vzDiv( n, a, b, y );

vmzDiv( n, a, b, y, 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.

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.

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.

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