std::tan(std::valarray)
Defined in header <valarray> |
||
---|---|---|
template< class T > valarray<T> tan( const valarray<T>& va ); |
For each element in va
computes tangent of the value of the element.
Parameters
va | - | value array to apply the operation to |
Return value
Value array containing tangents of the values in va
.
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 ofstd::valarray
are provided. -
std::valarray
,std::slice_array
,std::gslice_array
,std::mask_array
andstd::indirect_array
can be constructed from the replacement type. - All functions accepting an argument of type
const std::valarray&
exceptbegin()
andend()
(since C++11) should also accept the replacement type. - All functions accepting two arguments of type
const std::valarray&
should accept every combination ofconst 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.
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; } |
Example
#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
See also
applies the function std::sin to each element of valarray (function template) |
|
applies the function std::cos to each element of valarray (function template) |
|
applies the function std::atan to each element of valarray (function template) |
|
(C++11)(C++11)
|
computes tangent (\({\small\tan{x} }\)tan(x)) (function) |
computes tangent of a complex number (\({\small\tan{z} }\)tan(z)) (function template) |
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