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math: the error of log2(8) is 4.44e-16 which seems too large #4567

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griesemer opened this issue Dec 18, 2012 · 4 comments
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math: the error of log2(8) is 4.44e-16 which seems too large #4567

griesemer opened this issue Dec 18, 2012 · 4 comments
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Go1.1

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@griesemer
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http://play.golang.org/p/LP2YWj1nEJ

Result is:

2.9999999999999996 4.440892098500626e-16
@ianlancetaylor
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Comment 1:

Currently math.Log2 and math.Log10 are simply written in terms of math.Log.  That
introduces significant imprecision for results like this.  We need a proper
implementation.

Labels changed: added priority-soon, removed priority-triage.

@rsc
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rsc commented Dec 18, 2012

Comment 2:

Owner changed to @rsc.

Status changed to Started.

@rsc
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rsc commented Dec 18, 2012

Comment 3:

codereview.appspot.com/6943074

@rsc
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rsc commented Dec 20, 2012

Comment 4:

This issue was closed by revision a3677b5.

Status changed to Fixed.

@rsc rsc added this to the Go1.1 milestone Apr 14, 2015
@rsc rsc removed the go1.1 label Apr 14, 2015
@golang golang locked and limited conversation to collaborators Jun 24, 2016
@rsc rsc removed their assignment Jun 22, 2022
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