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atan2

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atan2

template<class T>
    valarray<T> atan2(const valarray<T>& x,
        const valarray<T>& y);
template<class T>
    valarray<T> atan2(const valarray<T> x, const T& y);
template<class T>
    valarray<T> atan2(const T& x, const valarray<T>& y);

The first template function returns an object of class valarray<T>, each of whose elements I is the arctangent of x[I] / y[I]. The second template function stores in element I the arctangent of x[I] / y. The third template function stores in element I the arctangent of x / y[I].