For a string I couldn't see any difference with or without the "1 ; however,
if it is greater than rank 1 the fill may not be what he wants.
_ ([ [^:(0...@]) ".)"1] '12,34 56 a',:''
1234 56 _
_ 0 0
On Tue, Jan 11, 2011 at 12:26 PM, Henry Rich <henryhr...@nc.rr.com> wrote:
> He said y was a string, and the rank of ". is infinite; so applied to a
> table it would give different results from what was requested.
>
> Henry Rich
>
> On 1/11/2011 2:11 PM, Don Guinn wrote:
> > 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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