Visible to Intel only — GUID: GUID-9E8ED83A-19AC-4E13-90F6-ECC3628ADC44
Visible to Intel only — GUID: GUID-9E8ED83A-19AC-4E13-90F6-ECC3628ADC44
v?Div
Performs element by element division of vector a by vector b
Syntax
call vsdiv( n, a, b, y )
call vsdivi(n, a, inca, b, incb, y, incy)
call vmsdiv( n, a, b, y, mode )
call vmsdivi(n, a, inca, b, incb, y, incy, mode)
call vddiv( n, a, b, y )
call vddivi(n, a, inca, b, incb, y, incy)
call vmddiv( n, a, b, y, mode )
call vmddivi(n, a, inca, b, incb, y, incy, mode)
call vcdiv( n, a, b, y )
call vcdivi(n, a, inca, b, incb, y, incy)
call vmcdiv( n, a, b, y, mode )
call vmcdivi(n, a, inca, b, incb, y, incy, mode)
call vzdiv( n, a, b, y )
call vzdivi(n, a, inca, b, incb, y, incy)
call vmzdiv( n, a, b, y, mode )
call vmzdivi(n, a, inca, b, incb, y, incy, mode)
Include Files
- mkl_vml.f90
Input Parameters
Name |
Type |
Description |
---|---|---|
n |
INTEGER, INTENT(IN) |
Specifies the number of elements to be calculated. |
a, b |
DOUBLE PRECISION for vddiv, vmddiv COMPLEX for vcdiv, vmcdiv DOUBLE COMPLEX for vzdiv, vmzdiv REAL, INTENT(IN) for vsdiv, vmsdiv DOUBLE PRECISION, INTENT(IN) for vddiv, vmddiv COMPLEX, INTENT(IN) for vcdiv, vmcdiv DOUBLE COMPLEX, INTENT(IN) for vzdiv, vmzdiv |
Arrays that specify the input vectors a and b. |
inca, incb, incy |
INTEGER, INTENT(IN) |
Specifies increments for the elements of a, b, and y. |
mode |
INTEGER(KIND=8), INTENT(IN) |
Overrides global VM mode setting for this function call. See vmlSetMode for possible values and their description. |
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 |
DOUBLE PRECISION for vddiv, vmddiv COMPLEX for vcdiv, vmcdiv DOUBLE COMPLEX for vzdiv, vmzdiv REAL, INTENT(OUT) for vsdiv, vmsdiv DOUBLE PRECISION, INTENT(OUT) for vddiv, vmddiv COMPLEX, INTENT(OUT) for vcdiv, vmcdiv DOUBLE COMPLEX, INTENT(OUT) for vzdiv, vmzdiv |
Array that specifies the output vector y. |
Description
The v?Div function performs element by element division of vector a by vector b.
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.