<valarray>
template<class T> valarray<T> atan (const valarray<T>& x);
Compute arc tangent of valarray elements
Returns a valarray object containing the principal value of the arc tangent of all the elements of x, expressed in radians.
This function overloads cmath's atan function.
Parameters
- x
- valarray containing elements of a type for which the unary function atan is defined.
Return value
A valarray object with the arc tangent 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
|
// atan valarray example
#include <iostream>
#include <cmath>
#include <valarray>
using namespace std;
int main ()
{
double val[] = {0.0, 0.25, 0.5, 0.75, 1.0};
valarray<double> foo (val,5);
valarray<double> bar = atan (foo);
cout << "foo: ";
for (size_t i=0; i<foo.size(); ++i)
cout << foo[i] << ' ';
cout << endl;
cout << "bar: ";
for (size_t i=0; i<bar.size(); ++i)
cout << bar[i] << ' ';
cout << endl;
return 0;
}
|
Output:
foo: 0 0.25 0.5 0.75 1
bar: 0 0.244979 0.463648 0.643501 0.785398
|
See also
| atan2 | Compute atan2 of valarray elements (function template) |
| tan | Compute tangent of valarray elements (function template) |
|