< cpp‎ | numeric‎ | valarray
Defined in header <valarray>
template< class T >
valarray<T> sin( const valarray<T>& va );

For each element in va computes sine of the value of the element.


[edit] Parameters

va - value array to apply the operation to

[edit] Return value

Value array containing sine of the values in va.

[edit] Notes

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

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

  • All const member functions of std::valarray are provided.
  • std::valarray, std::slice_array, std::gslice_array, std::mask_array and std::indirect_array can be constructed from the replacement type.
  • All functions accepting an argument of type const std::valarray& except begin() and end() (since C++14) should also accept the replacement type.
  • All functions accepting two arguments of type const std::valarray& should accept every combination of const std::valarray& and the replacement type.
  • The return type does not add more than two levels of template nesting over the most deeply-nested argument type.

[edit] Possible implementation

template<class T>
valarray<T> sin(const valarray<T>& va)
    valarray<T> other = va;
    for (T &i : other) {
        i = sin(i);

[edit] Example

#include <iostream>
#include <valarray>
#include <cmath>
const double pi = std::acos(-1);
int main()
    std::valarray<double> v1 = {0, 0.25, 0.5, 0.75, 1};
    std::valarray<double> v2 = std::sin(v1 * pi);
    for(double n : v2)
        std::cout << std::fixed << n << ' ';
    std::cout << '\n';


0.000000 0.707107 1.000000 0.707107 0.000000

[edit] See also

applies the function std::cos to each element of valarray
(function template)
applies the function std::tan to each element of valarray
(function template)
applies the function std::asin to each element of valarray
(function template)
computes sine (sin(x))
computes sine of a complex number (sin(z))
(function template)