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# std::sin(std::valarray)

From cppreference.com
< 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 a arguments of type const std::valarray& 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

Run this code

    #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';
    }

Output:

    0.000000 0.707107 1.000000 0.707107 0.000000

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