github.com/gopherd/gonum@v0.0.4/internal/cmplx64/isnan.go (about)

     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  // Copyright ©2017 The Gonum Authors. All rights reserved.
     6  // Use of this source code is governed by a BSD-style
     7  // license that can be found in the LICENSE file.
     8  
     9  package cmplx64
    10  
    11  import math "github.com/gopherd/gonum/internal/math32"
    12  
    13  // IsNaN returns true if either real(x) or imag(x) is NaN
    14  // and neither is an infinity.
    15  func IsNaN(x complex64) bool {
    16  	switch {
    17  	case math.IsInf(real(x), 0) || math.IsInf(imag(x), 0):
    18  		return false
    19  	case math.IsNaN(real(x)) || math.IsNaN(imag(x)):
    20  		return true
    21  	}
    22  	return false
    23  }
    24  
    25  // NaN returns a complex ``not-a-number'' value.
    26  func NaN() complex64 {
    27  	nan := math.NaN()
    28  	return complex(nan, nan)
    29  }