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