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// atan valarray example
#include <iostream> // std::cout
#include <cstddef> // std::size_t
#include <cmath> // std::atan(double)
#include <valarray> // std::valarray(valarray)
int main ()
{
double val[] = {0.0, 0.25, 0.5, 0.75, 1.0};
std::valarray<double> foo (val,5);
std::valarray<double> bar = atan (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;
}
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