1// Copyright 2010 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package cmplx
6
7import "math"
8
9// Phase returns the phase (also called the argument) of x.
10// The returned value is in the range [-Pi, Pi].
11func Phase(x complex128) float64 { return math.Atan2(imag(x), real(x)) }
12