blob: 8e971dbd3c4e2498ef3649e56d1863fa70fa7887 [file] [log] [blame]
// Copyright 2010 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 cmath
import "math"
// IsNaN returns true if either real(x) or imag(x) is NaN
// and neither is an infinity.
func IsNaN(x complex128) bool {
switch {
case math.IsInf(real(x), 0) || math.IsInf(imag(x), 0):
return false
case math.IsNaN(real(x)) || math.IsNaN(imag(x)):
return true
return false
// NaN returns a complex ``not-a-number'' value.
func NaN() complex128 {
nan := math.NaN()
return cmplx(nan, nan)