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https://issues.apache.org/jira/browse/MAHOUT-1490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13948974#comment-13948974
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Dmitriy Lyubimov commented on MAHOUT-1490:
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could be, i have no opinion on that; but that's not the primary objective
Scala does not support square brackets for this purpose. See Scala
bindings documentation for slicing. For the most part it is done
using overloaded magic methods (apply, update).
in case of data frames of course indexes of slices are not just
natural numbers anymore, although this set of course should be still
supported. i.e. (5, ::) selects 5th row, (3 until 5, 2 until 7)
selects slice etc etc.
There are 2 main differences of data frames from matrices from
functional perspective:
(1) slicing by names in addition to indices. This basically means
slicing by sequences of Strings (or individual name). something along
the lines dframe(::,("A","B","C")) to select columns A, B, C; same
for the rows.
(2) slices are not mahout-math vectors since they main contain not
just doubles, but potentially Strings as well. (a few predefined
simple types).
Again, reading spark bindings section of the manual will help.
As per current maven configuration (of math-scala module). at the
moment, i believe, it is 2.10.3. but it shouldn't matter really. Maven
and IntelliJ should handle this all automatically.
patch or github, yes, would be good.
this should be in the sparkbindings package of spark module.
> Data frame R-like bindings
> --------------------------
>
> Key: MAHOUT-1490
> URL: https://issues.apache.org/jira/browse/MAHOUT-1490
> Project: Mahout
> Issue Type: New Feature
> Reporter: Saikat Kanjilal
> Assignee: Dmitriy Lyubimov
> Original Estimate: 20h
> Remaining Estimate: 20h
>
> Create Data frame R-like bindings for spark
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