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Diffstat (limited to '')
-rw-r--r-- | src/math/cmplx/isnan.go | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/math/cmplx/isnan.go b/src/math/cmplx/isnan.go new file mode 100644 index 0000000..fed442c --- /dev/null +++ b/src/math/cmplx/isnan.go @@ -0,0 +1,25 @@ +// 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 reports whether 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) +} |