std::exp<div class="t-tr-text">（性病:: valarray的）<div class="t-tr-dropdown"><div><div><div class="t-tr-dropdown-arrow-border"></div><div class="t-tr-dropdown-arrow"></div><div class="t-tr-dropdown-h">Original:</div><div class="t-tr-dropdown-orig">(std::valarray)</div><div class="t-tr-dropdown-notes">The text has been machine-translated via [http://translate.google.com Google Translate].<br/> You can help to correct and verify the translation. Click [http://en.cppreference.com/w/Cppreference:MachineTranslations here] for instructions.</div></div></div></div></div>

 

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Numerics的图书馆

常见的数学函数

浮点环境

复数

数字阵列

伪随机数生成

编译时合理的算法 （C++11）

通用的数值运算 Original: Generic numeric operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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accumulate

inner_product

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std::valarray

成员函数 Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
valarray::valarray valarray::~valarray valarray::operator= valarray::operator[] valarray::swap valarray::size valarray::resize valarray::sum valarray::min valarray::max valarray::shift valarray::cshift valarray::apply	valarray::operator+ valarray::operator- valarray::operator~ valarray::operator! valarray::operator+= valarray::operator-= valarray::operator*= valarray::operator/= valarray::operator%= valarray::operator&= valarray::operator|= valarray::operator^= valarray::operator<<= valarray::operator>>=
非成员函数 Original: Non-member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
swap （C++11） begin （C++11） end （C++11） abs exp log log10 pow sqrt sin cos tan asin acos atan atan2 sinh cosh tanh	operator* operator/ operator% operator+ operator- operator^ None operator& operator| operator<< operator>> operator&& operator None operator== operator!= operator< operator> operator<= operator>=
Helper类 Original: Helper classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
slice_array gslice_array indirect_array	slice gslice mask_array

 

Defined in header <valarray>
template< class T > valarray<T> exp( const valarray<T>& va );

对于中的每个元素va计算 E提高的功率相等的元素的值.

Original:

For each element in va computes e raised to the power equal to the value of the element.

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参数

va

-

值的数组的操作 Original: value array to apply the operation to The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

返回值

值数组，包含“E”提出va中的值.

Original:

Value array containing e raised by the values in va.

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注释

碎末功能（exp）是用来执行计算。如果这种功能是不可用的，std::exp由于参数依赖查找.

Original:

Unqualified function (exp) is used to perform the computation. If such function is not available, std::exp is used due to argument dependent lookup.

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该功能可以实现从std::valarray不同的返回类型。在这种情况下，替换类型具有以下属性：

Original:

The function can be implemented with the return type different from std::valarray. In this case, the replacement type has the following properties:

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• const提供的所有std::valarray成员函数.

  Original:

  All const member functions of std::valarray are provided.

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• std::valarray，std::slice_array，std::gslice_array，std::mask_array和std::indirect_array可以由更换型.

  Original:

  std::valarray, std::slice_array, std::gslice_array, std::mask_array and std::indirect_array can be constructed from the replacement type.

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• 所有的函数接受一个参数的类型const std::valarray&也应接受替换类型.

  Original:

  All functions accepting a arguments of type const std::valarray& should also accept the replacement type.

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• 接受两个参数的类型const std::valarray&应该接受所有的功能const std::valarray&的每个组合和置换型.

  Original:

  All functions accepting two arguments of type const std::valarray& should accept every combination of const std::valarray& and the replacement type.

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可能的实现

template< class T > valarray<T> exp( const valarray<T>& va ) { valarray<T> other = va; for (T &i : other) { i = exp(i); } return other; // proxy object may be returned }

为例

这个例子演示了欧拉等式eiπ
= -1及相关指数.

Original:

This example demonstrates the Euler's identity eiπ
= -1 and the related exponents.

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#include <iostream>
#include <complex>
#include <valarray>
 
int main()
{
    const double pi = std::acos(-1);
    std::valarray<std::complex<double>> v = {
        {0, 0}, {0, pi/2}, {0, pi}, {0, 3*pi/2}, {0, 2*pi}
    };
    std::valarray<std::complex<double>> v2 = std::exp(v);
    for(auto n : v2) {
        std::cout << std::fixed << n << '\n';
    }
}

Output:

(1.000000,0.000000)
(0.000000,1.000000)
(-1.000000,0.000000)
(-0.000000,-1.000000)
(1.000000,-0.000000)

另请参阅

exp	返回“E”提出的功率（ex） Original: returns e raised to the given power (ex) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数）
exp(std::complex)	complex base e exponential （函数模板）