Hi Mike,
You may not know, but there is a new J app that Ian Clark has developed called
J901 (although it is running a version of J903 I believe) that supports {{ }}
You can find it in the app store for the iPad or the iPhone. The interface is
slightly different, but it is really good.
Cheers, bob
> On Jan 11, 2022, at 07:34, 'Mike Day' via Programming
> <[email protected]> wrote:
>
> Oh well. I thought you might have test-bedded these forms in J before moving
> to C, Henry, in which case there might have been a readymade J script!
>
> As for Raul’s suggestion, that’s fine, but, in as far as I have copied
> across to J701, just typing the verb’s name in the session reveals the n : 0
> ... ) form. Essentially, this leads to amending the J903 script, which
> rather defeats the purpose. I haven’t use nested ddefs.
>
> Anyway, I’ve got a little way into writing a basic parser which will suffice.
>
> Thanks,
>
> Mike
>
> Sent from my iPad
>
>> On 11 Jan 2022, at 14:42, Henry Rich <[email protected]> wrote:
>>
>> There is nothing I know of that does what {{ }} does. But Raul's idea is
>> pretty close. As he notes, it fails for nested {{ }} (there is much code
>> that expects the result of 5!:5 <'explicitname' to have the form m : string,
>> but nested {{ }} seemed OK).
>>
>> Henry Rich
>>
>>> On 1/11/2022 9:19 AM, Raul Miller wrote:
>>> If you avoid nested {{ }} blocks, 5!:5 would do this.
>>>
>>> In other words, this works:
>>>
>>> mean=: {{ (+/ % #) y}}
>>> 5!:5<'mean'
>>> 3 : '(+/ % #) y'
>>>
>>> But this would be useless for your purposes:
>>>
>>> mean=: {{ {{x + y}} {{u/}} {{x % y}} {{#y}} }}
>>> 5!:5<'mean'
>>> 3 : '{{ x + y }} {{ u/ }} {{ x % y }} {{ #y }} '
>>>
>>> FYI,
>>>
>>>
>>> --
>>> Raul
>>>
>>> On Tue, Jan 11, 2022 at 4:25 AM 'Mike Day' via Programming
>>> <[email protected]> wrote:
>>>> For Henry I expect: as I share code between J903 on the laptop and J701 on
>>>> this iPad, I’ve been avoiding the use of {{ }} objects. (My iPad can’t
>>>> support Ian’s new J902.)
>>>>
>>>> But I was just wondering about adding a routine to the J701 start.ijs
>>>> script to parse a J903 script translating direct definitions to their
>>>> earlier equivalents. And then I thought there might already be native J
>>>> code to do this.
>>>>
>>>> So: do I need to invent this wheel?
>>>>
>>>> Thanks,
>>>>
>>>> Mike
>>>>
>>>> Sent from my iPad
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>>
>>
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