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Source file src/math/cmplx/isnan.go

  // 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 cmplx
  
  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 complex(nan, nan)
  }
  

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