cos


function template
<valarray> 
template<class T> valarray<T> cos (const valarray<T>& x);

Compute cosine of valarray elements

Returns a valarray object containing the cosines of all the elements of x.

This function overloads cmath's cos function.

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

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// cos valarray example
#include <iostream>
#include <cmath>
#include <valarray>
using namespace std;

int main ()
{
  double val[] = {1.2, 3.14, 5.0};
  valarray<double> foo (val,3);

  valarray<double> bar = cos (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: 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)