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// atan2 valarray example
#include <iostream> // std::cout
#include <cstddef> // std::size_t
#include <cmath> // std::atan2
#include <valarray> // std::valarray, std::atan2
int main ()
{
double y[] = {0.0, 3.0, -2.0};
double x[] = {-3.0, 3.0, -1.0};
std::valarray<double> ycoords (y,3);
std::valarray<double> xcoords (x,3);
std::valarray<double> results = atan2 (ycoords,xcoords);
std::cout << "results:";
for (std::size_t i=0; i<results.size(); ++i)
std::cout << ' ' << results[i];
std::cout << '\n';
return 0;
}
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