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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