On Sun, Nov 4, 2012 at 3:25 PM, Michal D. <[email protected]> wrote:
> (0 1 4). I follow the argument for (arcs=: $ #: I.@) but my J is slow. We
> would have to be able to select an or of equals for example select from first
> column where the value is 0 or 1 or 4.
Here's select the rows of Y where number in the first column is contained in X:
X ((e.~ {."1) # ]) Y
For example:
sel0=: (e.~ {."1) # ]
7 21 35 sel0 i. 7 7
FYI,
--
Raul
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