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https://issues.apache.org/jira/browse/HAMA-765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13683758#comment-13683758
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Yexi Jiang commented on HAMA-765:
---------------------------------
In the definition of DoubleVector, there are two methods
'apply(DoubleVectorFunction func)', 'apply(DoubleDoubleVectorFunction func)' do
the same thing as I mentioned.
Actually, we do not need to treat Vector and Matrix separately. Therefore, we
only need to define two general classes DoubleFunction and
DoubleDoubleFunction, which can be used both by DoubleVector and DoubleMatrix.
Moreover, I checked the whole ml package, the original 'apply' methods as well
as the DoubleVectorFunction, DoubleDoubleVectorFunction are not used. In case
that the end users may have used them, all the old codes are kept and are
annotated as deprecated.
[~thomas.jungblut] I found this code is written by you, do you have any
comments?
> 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
>
> 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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