E.V.E
v2023.02.15
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◆
exp_int
auto eve::exp_int =
functor
<exp_int_t>
inline
constexpr
Header file
#include <eve/module/special.hpp>
Callable Signatures
namespace
eve
{
// Regular overload
constexpr
auto
exp_int
(
floating_value
auto
x)
noexcept
;
// 1
constexpr
auto
exp_int
(
unsigned_value
auto
n,
floating_value
auto
x)
noexcept
;
// 2
// Lanes masking
constexpr
auto
exp_int
[
conditional_expr
auto
c](
/*any of the above overloads*/
)
noexcept
;
// 3
constexpr
auto
exp_int
[
logical_value
auto
m](
/*any of the above overloads*/
)
noexcept
;
// 3
}
eve::conditional_expr
Specifies that a type is a Conditional Expression.
Definition
conditional.hpp:28
eve::floating_value
The concept floating_value<T> is satisfied if and only if T satisfies eve::value and the element type...
Definition
value.hpp:116
eve::logical_value
The concept logical_value<T> is satisfied if and only if T satisfies eve::value and the element type ...
Definition
value.hpp:132
eve::unsigned_value
The concept unsigned_value<T> is satisfied if and only if T satisfies eve::value and the element type...
Definition
value.hpp:84
eve::exp_int
constexpr auto exp_int
elementwise_callable object computing the exponential integral .
Definition
exp_int.hpp:83
eve
EVE Main Namespace.
Definition
abi.hpp:18
Parameters
n
:
unsigned argument
. If not present taken to be 1.
x
:
real floating argument
.
c
:
Conditional expression
masking the operation.
m
:
Logical value
masking the operation.
Return value
The value of the exponential integral \( \mathbf{E}_n(x) = \displaystyle \int_1^\infty \frac{e^{-xt}}{t^n}\;\mbox{d}t\), is returned.
The operation is performed conditionnaly
.
External references
Wolfram MathWorld:Exponential Integral
DLMF: Generalized Exponential Integral
Wikipedia: Exponential integral
Example
// revision 1
#include <eve/module/special.hpp>
#include <iostream>
int
main()
{
eve::wide
wf = {0.5, 1.5, 0.1, 1.0, 19.0, 25.0, 21.5, 10000.0};
eve::wide
wi = {0, 1, 5, -2, 10, 6000, 0, 2};
std::cout <<
"<- wf = "
<< wf <<
"\n"
;
std::cout <<
"<- wi = "
<< wi <<
"\n"
;
std::cout <<
"-> exp_int(wf) = "
<<
eve::exp_int
(wf) <<
"\n"
;
std::cout <<
"-> exp_int(wi, wf) = "
<<
eve::exp_int
(wi, wf) <<
"\n"
;
std::cout <<
"-> exp_int[ignore_last(2)](wf)= "
<<
eve::exp_int
[
eve::ignore_last
(2)](wf) <<
"\n"
;
std::cout <<
"-> exp_int[wf< 25.0](wf) = "
<<
eve::exp_int
[wf < 25.0](wf) <<
"\n"
;
}
eve::ignore_last
Conditional expression ignoring the k last lanes from a eve::simd_value.
Definition
conditional.hpp:332
eve::wide
Wrapper for SIMD registers.
Definition
wide.hpp:70
eve