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 5 package cmplx 6 7 import "math" 8 9 // IsNaN returns true if either real(x) or imag(x) is NaN 10 // and neither is an infinity. 11 func IsNaN(x complex128) bool { 12 switch { 13 case math.IsInf(real(x), 0) || math.IsInf(imag(x), 0): 14 return false 15 case math.IsNaN(real(x)) || math.IsNaN(imag(x)): 16 return true 17 } 18 return false 19 } 20 21 // NaN returns a complex ``not-a-number'' value. 22 func NaN() complex128 { 23 nan := math.NaN() 24 return complex(nan, nan) 25 } 26
