Source File
log10.go
Belonging Package
math
// 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 ( float64) float64 {
if haveArchLog10 {
return archLog10()
}
return log10()
}
func log10( float64) float64 {
return Log() * (1 / Ln10)
}
// Log2 returns the binary logarithm of x.
// The special cases are the same as for [Log].
func ( float64) float64 {
if haveArchLog2 {
return archLog2()
}
return log2()
}
func log2( float64) float64 {
, := Frexp()
// 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 == 0.5 {
return float64( - 1)
}
return Log()*(1/Ln2) + float64()
}
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