std::asin(std::valarray)
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std::valarray
Defined in header
<valarray>
template< class T >
valarray<T> asin( const valarray<T>& va );
valarray<T> asin( const valarray<T>& va );
For each element in va computes arc sine of the value of the element.
[edit] Parameters
va
-
value array to apply the operation to
[edit] Return value
Value array containing arc sines of the values in va.
[edit] Notes
Unqualified function (asin) is used to perform the computation. If such function is not available, std::asin 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> asin(const valarray<T>& va) { valarray<T> other = va; for (T& i : other) i = asin(i); return other; // proxy object may be returned }
[edit] Example
Run this code
#include <cmath> #include <iostream> #include <numbers> #include <valarray> int main() { // take common y-values from unit circle const double s22 = std::sqrt (2.0) / 2.0; const double s32 = std::sqrt (3.0) / 2.0; const std::valarray <double> v1 = {-1.0, -s32, -s22, -0.5, 0.0, 0.5, s22, s32, 1.0}; // fill with results of radians to degrees conversion const std::valarray <double> v2 = std::asin (v1) * 180.0 / std::numbers::pi ; for (std::cout << std::showpos ; double n : v2) std::cout << n << "° "; std::cout << '\n'; }
Output:
-90° -60° -45° -30° +0° +30° +45° +60° +90°
[edit] See also
(C++11)
(function template) [edit]
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