v?ExpInt1
v?ExpInt1
Computes the exponential integral of vector elements.
Syntax
vsExpInt1
(
n
,
a
,
y
)
;
vsExpInt1I(n, a, inca, y, incy);
vmsExpInt1
(
n
,
a
,
y
,
mode
)
;
vmsExpInt1I(n, a, inca, y, incy, mode);
vdExpInt1
(
n
,
a
,
y
)
;
vdExpInt1I(n, a, inca, y, incy);
vmdExpInt1
(
n
,
a
,
y
,
mode
)
;
vmdExpInt1I(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 vsExpInt1 , vmsExpInt1 const double* for vdExpInt1 , vmdExpInt1 | Pointer to an array that contains the input vector a . |
inca , incy | const MKL_INT | Specifies increments for the elements of a 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 vsExpInt1 , vmsExpInt1 double* for vdExpInt1 , vmdExpInt1 | Pointer to an array that contains the output vector y . |
Description
The
v?ExpInt1
function computes the exponential integral E
1
of vector elements.For positive real values
x
, this can be written as:
For negative real values
x
, the result is defined as NAN
.Argument | Result | VM Error Status | Exception |
|---|---|---|---|
x < +0 | QNAN | VML_STATUS_ERRDOM | INVALID |
+0 | + ∞ | VML_STATUS_SING | ZERODIVIDE |
-0 | + ∞ | VML_STATUS_SING | ZERODIVIDE |
+ ∞ | +0 | ||
- ∞ | QNAN | VML_STATUS_ERRDOM | INVALID |
QNAN | QNAN | ||
SNAN | QNAN | INVALID |