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Date: Wed, 18 Jan 2012 07:18:43 +0000 (UTC)
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Subject: [jira] [Commented] (MATH-677) About package "transform"
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    [ https://issues.apache.org/jira/browse/MATH-677?page=3Dcom.atlassian.j=
ira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D131883=
15#comment-13188315 ]=20

S=C3=A9bastien Brisard commented on MATH-677:
----------------------------------------

Improved testing of {{FastFourierTransformer}} in {{r1232767}}.
               =20
> About package "transform"
> -------------------------
>
>                 Key: MATH-677
>                 URL: https://issues.apache.org/jira/browse/MATH-677
>             Project: Commons Math
>          Issue Type: Improvement
>            Reporter: Gilles
>            Assignee: S=C3=A9bastien Brisard
>            Priority: Minor
>              Labels: api-change
>             Fix For: 3.0
>
>
> Classes in package "o.a.c.m.transform" might require some changes in orde=
r to conform to goals set for the next major release.
> Some observations:
> # Exceptions
> ## Should remove use of deprecated "MathRuntimeException"
> ## Should throw more specific "Math...Exception" instances instead of sta=
ndard IAE
> # Interface "RealTransformer" (and implementations) contain non-conforman=
t method names (e.g. "inversetransform" instead of "inverseTransform"). {co=
lor:red}Fixed in {{r1208293}}.{color}
> # "FastFourierTransformer":
> ## Methods "mdfft" and "verifyDataSet" take an argument of type "Object" =
(to allow an argument with an unspecified number of dimensions)
> ## The "RootsOfUnity" helper class could be moved to the "complex" packag=
e
> ## For clarity, multidimensional transform should be moved to a class of =
its own (and I also wonder whether the "MultiDimensionalComplexMatrix" name=
 is not misleading)
> # "FastFourierTransformer", "FastSineTranformer" and "FastCosineTranforme=
r" define public methods "tranform2" and "inversetransform2" but they are n=
ot part of an interface. {color:red}As of {{r1213157}}, these methods have =
been removed, and replaced by factory methods {{create()}} and {{createUnit=
ary()}} (FFT) or {{createOrthogonal()}} (FCT, FST).{color}
> # Code uses variables that start with an uppercase. {color:red}Fixed, tog=
ether with various formatting issues.{color}
> # "FastHadamardTransformer" contains illegible developer documentation (s=
ee Javadoc for protected method "fht"). {color:red}Tried to improve things =
in {{r1208986}}, but things are still a bit obscure. Besides, the link prov=
ided is broken. Will look into that.{color}

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