[Jprogramming] What would be a nicer way to check if argument is numeric

[Raul Miller]

That implementation also does not work on sparse data types:

   numeric 4+0 $.i.3
1
   isnumeric 4+0 $.i.3
0

FYI,

-- 
Raul

On Thu, Nov 9, 2017 at 1:03 PM, Kenneth Lettow <klettow at thomasnet.com> wrote:
> From ~addons/general/misc/validate.ijs
>
> isnumeric=: 3!:0 e. 1 4 8 16 64 128"_
>
> Though I don't know if this qualifies as nicer!
>
> On Thu, Nov 9, 2017 at 12:20 PM, Michael Berry <mjaberry at gmail.com> wrote:
>
>> Hello J world,
>>
>> I have a verb that returns scalar 1 if the argument is numeric of any shape
>> and scalar 0 otherwise.
>> It works fine:
>>
>>    numeric i. 5
>>
>> 1
>>
>>    numeric 9
>>
>> 1
>>
>>    numeric i. 2 3 4
>>
>> 1
>>
>>    numeric 'cat'
>>
>> 0
>>
>>    numeric 3#<i. 4
>>
>> 0
>>
>>
>> My definition feels clumsy, however. Can anyone suggest something nicer?
>>
>>
>> numeric=: monad : '0 -: 0{ , 1{. 0#y'
>>
>>
>> -Michael
>> ----------------------------------------------------------------------
>> For information about J forums see http://www.jsoftware.com/forums.htm
>
>
>
>
> --
> *Kenneth Lettow*
> Director Market Intelligence | Thomas™
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