function template
<valarray>
std::cos
template<class T> valarray<T> cos (const valarray<T>& x);
Compute cosine of valarray elements
Returns a valarray containing the cosines of all the elements of x, in the same order.
The function calls cos (unqualified) once for each element.
This function overloads cmath's cos.
Parameters
- x
- valarray containing elements of a type for which the unary function cos is defined. Each element's value represents an angle, expressed in radians.
Return value
A valarray object with the cosine values of the elements of x.
Example
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
// cos valarray example
#include <iostream> // std::cout
#include <cstddef> // std::size_t
#include <cmath> // std::cos(double)
#include <valarray> // std::valarray, std::cos(valarray)
int main ()
{
double val[] = {1.2, 3.14, 5.0};
std::valarray<double> foo (val,3);
std::valarray<double> bar = cos (foo);
std::cout << "foo:";
for (std::size_t i=0; i<foo.size(); ++i)
std::cout << ' ' << foo[i];
std::cout << '\n';
std::cout << "bar: ";
for (std::size_t i=0; i<bar.size(); ++i)
std::cout << ' ' << bar[i];
std::cout << '\n';
return 0;
}
Output:
foo: 1.2 3.14 5
bar: 0.362358 -0.999999 0.283662
See also
- cos (cmath)
- Compute cosine (function)
- sin
- Compute sine of valarray elements (function template)
- tan
- Compute tangent of valarray elements (function template)