std::cosh(std::valarray)
Defined in header <valarray> |
||
---|---|---|
template< class T > valarray<T> cosh( const valarray<T>& va ); |
For each element in va
computes hyperbolic cosine of the value of the element.
Parameters
va | - | value array to apply the operation to |
Return value
Value array containing hyperbolic cosine of the values in va
.
Notes
Unqualified function (cosh
) is used to perform the computation. If such function is not available, std::cosh
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> cosh(const valarray<T>& va) { valarray<T> other = va; for (T &i : other) { i = cosh(i); } return other; } |
Example
#include <cmath> #include <iomanip> #include <iostream> #include <valarray> void show(const char* title, const std::valarray<float>& data) { const int w { 9 }; std::cout << std::setw(w) << title << " | "; for (float x : data) std::cout << std::setw(w) << x << " | "; std::cout << '\n'; } int main() { const std::valarray<float> x { .1, .2, .3, .4 }; const auto sinh = std::sinh(x); const auto cosh = std::cosh(x); const auto z = (cosh * cosh) - (sinh * sinh); show("x" , x ); show("sinh(x)", sinh); show("cosh(x)", cosh); show("z" , z ); }
Output:
x | 0.1 | 0.2 | 0.3 | 0.4 | sinh(x) | 0.100167 | 0.201336 | 0.30452 | 0.410752 | cosh(x) | 1.005 | 1.02007 | 1.04534 | 1.08107 | z | 1 | 1 | 1 | 1 |
See also
applies the function std::sinh to each element of valarray (function template) |
|
applies the function std::tanh to each element of valarray (function template) |
|
(C++11)(C++11)
|
computes hyperbolic cosine (\({\small\cosh{x} }\)cosh(x)) (function) |
computes hyperbolic cosine of a complex number (\({\small\cosh{z} }\)cosh(z)) (function template) |
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