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Date: Fri, 21 Jun 2013 22:06:21 +0000 (UTC)
From: "Yexi Jiang (JIRA)" <jira@apache.org>
To: dev@hama.apache.org
Message-ID: <JIRA.12652795.1371177759665.158211.1371852381826@arcas>
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Subject: [jira] [Commented] (HAMA-765) Add apply method to Vector/Matrix
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    [ https://issues.apache.org/jira/browse/HAMA-765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13690790#comment-13690790 ] 

Yexi Jiang commented on HAMA-765:
---------------------------------

Hi, Edward,

I didn't notice your last comment. Please rollback the commit first. Sorry for the inconvenience.

                
> Add apply method to Vector/Matrix
> ---------------------------------
>
>                 Key: HAMA-765
>                 URL: https://issues.apache.org/jira/browse/HAMA-765
>             Project: Hama
>          Issue Type: Improvement
>    Affects Versions: 0.6.2
>            Reporter: Yexi Jiang
>            Assignee: Yexi Jiang
>            Priority: Minor
>             Fix For: 0.6.3
>
>         Attachments: HAMA-765.patch, HAMA-765.patch, HAMA-765.patch, HAMA-765.patch
>
>
> Add 'apply' method to Vector/Matrix to allow ad-hoc function apply to the elements of a Vector/Matrix.
> For example, if a function f( x ) needs to apply to the elements of a vector v, then we can use
> ------------
> DoubleFunction fun = new DoubleFunction() {
>   public double apply(double element) {
>     //  do what ever
>   }
> };
> v.apply(fun);
> ------------
> This method borrows the style of functional programming by allowing a function to apply to all the elements of a Vector/Matrix. It can simply the coding, especially for those algorithms where Vector/Matrix operations are heavily used.

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