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std::expint

STD：Exint，STD：：Exintf，STD：：Exintl

double expint( double arg double expint( float arg double expint( long double arg float expintf( float arg long double expintl( long double arg (1)(since C++17)
double expint( Integral arg (2)(since C++17)

1%29计算指数积分成arg...

4%29一组过载或接受任意参数的函数模板积分型将参数转换为double...

参数

arg-value of a floating-point or Integral type

返回值

如果没有错误发生，则指数积分的值arg，即-f∞。

-Arg

电子-t

*。

T型

丁T型，被归还。

错误处理

错误可以按数学[医]错误处理...

  • 如果参数为nan，则返回nan，并且不报告域错误。

  • 如果参数为±0，则返回-∞

注记

不支持C++17但支持的实现ISO 29124：2010，则提供此功能__STDCPP_MATH_SPEC_FUNCS__由实现定义为值至少为201003L，且用户定义__STDCPP_WANT_MATH_SPEC_FUNCS__在包含任何标准库头之前。

不支持iso 29124：2010但支持tr 19768：2007%28TR1%29的实现，在标头中提供此功能。tr1/cmath和命名空间std::tr1...

此功能的实现也是可以在中学里找到。...

例

二次

#include <cmath>
#include <iostream>
int main()
{
    std::cout << "Ei(0) = " << std::expint(0) << '\n'
              << "Ei(1) = " << std::expint(1) << '\n'
              << "Gompetz constant = " << -std::exp(1)*std::expint(-1) << '\n';
}

二次

产出：

二次

Ei(0) = -inf
Ei(1) = 1.89512
Gompetz constant = 0.596347

二次

外部链接

Weisstein，Eric W.“指数积分”来自MathWorld的一个Wolfram Web资源。

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