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// Copyright 2009 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 math // Log10 returns the decimal logarithm of x. // The special cases are the same as for [Log]. func Log10(x float64) float64 { if haveArchLog10 { return archLog10(x) } return log10(x) } func log10(x float64) float64 { return Log(x) * (1 / Ln10) } // Log2 returns the binary logarithm of x. // The special cases are the same as for [Log]. func Log2(x float64) float64 { if haveArchLog2 { return archLog2(x) } return log2(x) } func log2(x float64) float64 { frac, exp := Frexp(x) // Make sure exact powers of two give an exact answer. // Don't depend on Log(0.5)*(1/Ln2)+exp being exactly exp-1. if frac == 0.5 { return float64(exp - 1) } return Log(frac)*(1/Ln2) + float64(exp) }
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