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      std::exp(std::valarray)

      From cppreference.com
      <cpp‎ |numeric‎ |valarray
       
       
       
      std::valarray
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      Defined in header<valarray>
      template<class T>
      valarray<T> exp(const valarray<T>& va);

      For each element inva computese raised to the power equal to the value of the element.

      Contents

      [edit]Parameters

      va - value array to apply the operation to

      [edit]Return value

      Value array containinge raised by the values inva.

      [edit]Notes

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

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

      [edit]Possible implementation

      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}

      [edit]Example

      This example demonstrates theEuler's identitye
      = -1
      and the related exponents.

      Run this code
      #include <complex>#include <iostream>#include <numbers>#include <valarray> int main(){constdouble pi=std::numbers::pi;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(std::cout<<std::showpos<<std::fixed;auto n: v2)std::cout<< n<<'\n';}

      Output:

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

      [edit]See also

      applies the functionstd::log to each element of valarray
      (function template)[edit]
      (C++11)(C++11)
      returnse raised to the given power (\({\small e^x}\)ex)
      (function)[edit]
      complex basee exponential
      (function template)[edit]
      Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/numeric/valarray/exp&oldid=160804"

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