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      std::cos(std::valarray)

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

      For each element inva computes cosine of the value of the element.

      Contents

      [edit]Parameters

      va - value array to apply the operation to

      [edit]Return value

      Value array containing cosines of the values inva.

      [edit]Notes

      Unqualified function (cos) is used to perform the computation. If such function is not available,std::cos 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> cos(const valarray<T>& va){    valarray<T> other= va;for(T& i: other)        i= cos(i); return other;// proxy object may be returned}

      [edit]Example

      Run this code
      #include <cmath>#include <iomanip>#include <iostream>#include <valarray> void show(constchar* title,conststd::valarray<float>& data){constint w{9};std::cout<<std::setw(w)<< title<<" | ";for(float x: data)std::cout<<std::setw(w)<< x<<" | ";std::cout<<'\n';} int main(){conststd::valarray<float> x{.1,.2,.3,.4};constauto sin=std::sin(x);constauto cos=std::cos(x);constauto z=(sin* sin)+(cos* cos);     show("x", x);    show("sin(x)", sin);    show("cos(x)", cos);    show("z", z);}

      Output:

              x |       0.1 |       0.2 |       0.3 |       0.4 |    sin(x) | 0.0998334 |  0.198669 |   0.29552 |  0.389418 |    cos(x) |  0.995004 |  0.980067 |  0.955337 |  0.921061 |         z |         1 |         1 |         1 |         1 |

      [edit]See also

      applies the functionstd::sin to each element of valarray
      (function template)[edit]
      applies the functionstd::tan to each element of valarray
      (function template)[edit]
      applies the functionstd::acos to each element of valarray
      (function template)[edit]
      (C++11)(C++11)
      computes cosine (\({\small\cos{x}}\)cos(x))
      (function)[edit]
      computes cosine of a complex number (\({\small\cos{z}}\)cos(z))
      (function template)[edit]
      Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/numeric/valarray/cos&oldid=160801"

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