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From "Yexi Jiang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HAMA-765) Add apply method to Vector/Matrix
Date Tue, 18 Jun 2013 14:49:21 GMT

    [ https://issues.apache.org/jira/browse/HAMA-765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13686796#comment-13686796

Yexi Jiang commented on HAMA-765:

When is the deadline? 

I think I need to write more test cases to ensure its correctness.
Moreover, I may need to modify the regression and MLP to unify them in Vector/Matrix manipulation
and cost function calculation, as [~teofili] said.
> Add apply method to Vector/Matrix
> ---------------------------------
>                 Key: HAMA-765
>                 URL: https://issues.apache.org/jira/browse/HAMA-765
>             Project: Hama
>          Issue Type: Improvement
>            Reporter: Yexi Jiang
>            Assignee: Yexi Jiang
>            Priority: Minor
>         Attachments: 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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