Developer Reference

Contents

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
.
Special Values for Real Function
v?ExpInt1(x)
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

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804