| // Copyright 2009 The Go Authors. All rights reserved. | |
| // Use of this source code is governed by a BSD-style | |
| // license that can be found in the LICENSE file. | |
| package math | |
| // Fabs returns the absolute value of x. | |
| // | |
| // Special cases are: | |
| // Fabs(+Inf) = +Inf | |
| // Fabs(-Inf) = +Inf | |
| // Fabs(NaN) = NaN | |
| func Fabs(x float64) float64 { | |
| switch { | |
| case x < 0: | |
| return -x | |
| case x == 0: | |
| return 0 // return correctly fabs(-0) | |
| } | |
| return x | |
| } |