std::atan(std::valarray)

 

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Defined in header <valarray>
template< class T > valarray<T> atan( const valarray<T>& va );

For each element in va computes arc tangent of the value of the element.

Parameters

va

-

value array to apply the operation to

Return value

Value array containing arc tangents of the values in va.

Notes

Unqualified function (atan) is used to perform the computation. If such function is not available, std::atan 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.

Possible implementation

template<class T> valarray<T> atan(const valarray<T>& va) { valarray<T> other = va; for (T& i : other) i = atan(i);   return other; // proxy object may be returned }

Example

Run this code

#include <algorithm>
#include <cmath>
#include <iostream>
#include <valarray>
 
auto show = [](char const* title, const std::valarray<float>& va)
{
    std::cout << title << " :";
    std::for_each(std::begin(va), std::end(va), 
        [](const float x) { std::cout << "  " << std::fixed << x; });
    std::cout << '\n';
};
 
int main()
{
    const std::valarray<float> x = {.1f, .3f, .6f, .9f};
    const std::valarray<float> f = std::atan(x);
    const std::valarray<float> g = std::tan(f);
 
    show("x          ", x);
    show("f = atan(x)", f);
    show("g = tan(f) ", g);
}

Output:

x           :  0.100000  0.300000  0.600000  0.900000
f = atan(x) :  0.099669  0.291457  0.540420  0.732815
g = tan(f)  :  0.100000  0.300000  0.600000  0.900000

See also

asin(std::valarray)	applies the function std::asin to each element of valarray (function template)
acos(std::valarray)	applies the function std::acos to each element of valarray (function template)
atan2(std::valarray)	applies the function std::atan2 to a valarray and a value (function template)
tan(std::valarray)	applies the function std::tan to each element of valarray (function template)
atanatanfatanl (C++11)(C++11)	computes arc tangent (\({\small\arctan{x}}\)arctan(x)) (function)
atan(std::complex) (C++11)	computes arc tangent of a complex number (\({\small\arctan{z}}\)arctan(z)) (function template)