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https://issues.apache.org/jira/browse/MATH-504?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Luc Maisonobe resolved MATH-504.
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Resolution: Fixed
Fix Version/s: 3.0
Fixed in subversion repository as of r1132439.
Thanks for the report
> LOESS interpolation & tricube fonction
> --------------------------------------
>
> Key: MATH-504
> URL: https://issues.apache.org/jira/browse/MATH-504
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 2.1
> Environment: Win XP
> Reporter: X. B.
> Priority: Trivial
> Labels: loess
> Fix For: 3.0
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> the doc for tricube fonction used in LOESS smooth() says :
> * @return <code>(1 - |x|<sup>3</sup>)<sup>3</sup></code>.
> But I'dont see the absolute value for x.
> Also, the "classical" tricube fonction (see
> http://www.itl.nist.gov/div898/handbook/pmd/section1/pmd144.htm)
> seems to return 0 if abs( x )>1.
> In the code of the tricube method, It is apparently not the case...
> private static double tricube(final double x) {
> final double tmp = 1 - x * x * x;
> return tmp * tmp * tmp;
> }
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