v?Log2
v?Log2
Computes the base 2 logarithm of vector elements.
Syntax
vsLog2
(
n
,
a
,
y
);
vsLog2I(n, a, inca, y, incy);
vmsLog2
(
n
,
a
,
y
,
mode
);
vmsLog2I(n, a, inca, y, incy, mode);
vdLog2
(
n
,
a
,
y
);
vdLog2I(n, a, inca, y, incy);
vmdLog2
(
n
,
a
,
y
,
mode
);
vmdLog2I(n, a, inca, 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 | const float* for vsLog2 const float* for vmsLog2 const double* for vdLog2 const double* for vmdLog2 | Pointer to the array containing the input vector a . |
inca , incy | const MKL_INT | Specifies increments for the elements of a and y . |
mode | const MKL_INT64 | Overrides the global VM mode setting for this
function call. See
vmlSetMode
for possible values and their
description. |
Output Parameters
Name | Type | Description |
|---|---|---|
y | float* for vsLog2 float* for vmsLog2 double* for vdLog2 double* for vmdLog2 | Pointer to an array containing the output vector y . |
Description
The
v?Log2
function computes the base 2 logarithm of vector elements.See Special Value Notations for the conventions used in this table:
Argument | Result | VM Error Status | Exception |
|---|---|---|---|
+1 | +0 | ||
x < +0 | QNAN | VML_STATUS_ERRDOM | INVALID |
+0 | - ∞ | VML_STATUS_SING | ZERODIVIDE |
-0 | - ∞ | VML_STATUS_SING | ZERODIVIDE |
- ∞ | QNAN | VML_STATUS_ERRDOM | INVALID |
+ ∞ | + ∞ | ||
QNAN | QNAN | ||
SNAN | QNAN | INVALID |