std::tan(std::valarray)
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std::valarray
Defined in header
<valarray>
template< class T >
valarray<T> tan( const valarray<T>& va );
valarray<T> tan( const valarray<T>& va );
For each element in va computes tangent of the value of the element.
[edit] Parameters
va
-
value array to apply the operation to
[edit] Return value
Value array containing tangents of the values in va.
[edit] Notes
Unqualified function (tan) is used to perform the computation. If such function is not available, std::tan 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.
- For every function taking a const std::valarray <T>& except begin() and end() (since C++11), identical functions taking the replacement types shall be added;
- For every function taking two const std::valarray <T>& arguments, identical functions taking every combination of const std::valarray <T>& and replacement types shall be added.
- 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> tan(const valarray<T>& va) { valarray<T> other = va; for (T& i : other) i = tan(i); return other; // proxy object may be returned }
[edit] Example
Run this code
#include <cmath> #include <iostream> #include <valarray> auto show = [](char const* title, const std::valarray <double>& va) { std::cout << title << " :"; for (auto x : va) std::cout << " " << std::fixed << x; std::cout << '\n'; }; int main() { const std::valarray <double> x = {.0, .1, .2, .3}; const std::valarray <double> y = std::tan (x); const std::valarray <double> z = std::atan (y); show("x ", x); show("y = tan(x) ", y); show("z = atan(y)", z); }
Output:
x : 0.000000 0.100000 0.200000 0.300000 y = tan(x) : 0.000000 0.100335 0.202710 0.309336 z = atan(y) : 0.000000 0.100000 0.200000 0.300000
[edit] See also
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