Why is there a "1 on the definition?
On Tue, Jan 11, 2011 at 9:29 AM, Henry Rich <henryhr...@nc.rr.com> wrote:
> How about
>
> ([ [^:(0...@]) ".)"1
>
> Henry Rich
>
> On 1/11/2011 10:46 AM, richard.vaug...@us.thewg.com wrote:
> > I need a simple utility that will return the numeric value represented by
> > a string y, following the rules of dyadic ". except returning the scalar
> x
> > if y is empty. This should be fast since it is to be applied under> to
> > large arrays of boxed strings whose exact format cannot be controlled. I
> > have observed that if y is preceded by a TAB the result of ". is
> > unchanged, and if y is a TAB alone the result is x; therefore adding a
> TAB
> > before (each) y seems to do the trick. But this is not documented in the
> > Vocabulary. Can I trust this behaviour to continue in future editions of
> > J?
> >
> > Adding a space would seem more natural but ". treats y that is all spaces
> > like an empty vector. Best would be if the left argument to ". had an
> > optional second element, specifying the exact number of elements to be
> > returned in each row, or default 0 for the present behaviour. Then I
> > could force an empty y to receive the padding value 0{x.
> >
> > Thanks,
> >
> > Richard Vaughan
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