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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MATH-430) Function objects
Date Fri, 05 Nov 2010 15:58:42 GMT

     [ https://issues.apache.org/jira/browse/MATH-430?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gilles updated MATH-430:
------------------------

    Attachment: func.tar.gz

As part of this issue, I'm proposing an alternative to the current "ComposableFunction" class.

The attached file contains part of the functionality (e.g. function composition, addition
and multiplication). There are tests showing the intended usage.

The main difference with "ComposableFunction" is that utilities (e.g. operators) and function
objects are separate: Having a "FunctionUtils" keeps the overall design more uniform (similar,
in spirit,  to the other "...Utils" classes in CM). The purpose is also to stay minimalist
(e.g. no need to have a "divide" method since you can create it with "multiply" and an "Inverse"
function object).
Also, function objects are first-class citizens, not needing the "import static" construct
to be used with relative ease.

Please, let me know whether this is going in the right direction.


> Function objects
> ----------------
>
>                 Key: MATH-430
>                 URL: https://issues.apache.org/jira/browse/MATH-430
>             Project: Commons Math
>          Issue Type: Bug
>            Reporter: Gilles
>            Assignee: Gilles
>            Priority: Minor
>             Fix For: 3.0
>
>         Attachments: func.tar.gz
>
>
> Create a package {{function}} to contain classes implementing the {{UnivariateRealFunction}}
interface for all the usual functions.
> As a consequence, all {{mapXxx}} methods and {{mapXxxToSelf}} methods in {{RealVector}}
can be respectively replaced with
> {code}
> public void map(UnivariateRealFunction f);
> {code}
> and
> {code}
> public void mapToSelf(UnivariateRealFunction f);
> {code}

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