acos


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

Compute arc cosine of valarray elements

Returns a valarray object containing the principal value of the arc cosine of all the elements of x, expressed in radians.

This function overloads cmath's acos function.

Parameters

x
valarray containing elements of a type for which the unary function acos is defined.


Return value

A valarray object with the arc cosine values of the elements of x.

Example

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// acos 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 = acos (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: 1.5708 1.31812 1.0472 0.722734 0


See also

acos (cmath) Compute arc cosine (function)
cos Compute cosine of valarray elements (function template)
asin Compute arc sine of valarray elements (function template)