std::cosh(std::valarray)

Header: <valarray>

For each element in va computes hyperbolic cosine of the value of the element.

# Declarations

template< class T >
valarray<T> cosh( const valarray<T>& va );

# Parameters

# 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:

# 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);
}

# See also