Getting off topic, but why don’t the new Fold primitives work in the iPad app,
given it’s J9.03 beta-k?
The info screen links to a NuVoc description. I tried the example starting
with
v=: dyad define
z=. y + 0.01
z [smoutput x ; 'v' ; y ; '-->' ; z
)
…..
Pasting into a new script and running leads to the kind of error reported by Ed.
Cheers,
Mike
Sent from my iPad
> On 21 Oct 2022, at 23:21, Ian Clark <earthspo...@gmail.com> wrote:
>
> Bob writes
>> I am pretty sure that the iPad version of J is version 901
>
> Actually it's the beta-k version of j903.
> j901 is the App Store "Product Name" (…poor choice) and is carved in
> stone, alas.
> Updates have to keep the same name, else it's an entirely new product.
>
>> On Fri, 21 Oct 2022 at 19:57, 'robert therriault' via Programming <
>> programm...@jsoftware.com> wrote:
>>
>> Ed,
>>
>> I am pretty sure that the iPad version of J is version 901
>>
>> Cheers, bob
>>
>>> On Oct 21, 2022, at 11:55, Jan-Pieter Jacobs <janpieter.jac...@gmail.com>
>> wrote:
>>>
>>> I don't know whether you'r only looking for a tacit function, but this
>>> would also likely work if fold is unavailable for you (untested):
>>>
>>> {{ for_val. y do. if. f val do. val_index{y return. end. end.}} coords
>>>
>>> Jan-Pieter
>>>
>>> On Fri, 21 Oct 2022, 19:51 Ed Gottsman, <edward.j.gotts...@gmail.com>
>> wrote:
>>>
>>>> Pascal,
>>>>
>>>> Your original solution is perfect for me—I don’t happen to need the
>>>> index. And there may in fact be no items with f = 1.
>>>>
>>>> Very clever: it gets a place of honor in the flashcard deck :-).
>>>>
>>>> Many thanks.
>>>>
>>>> Ed
>>>>
>>>> Sent from my iPad
>>>>
>>>>> On Oct 21, 2022, at 12:46 PM, 'Pascal Jasmin' via Programming <
>>>> programm...@jsoftware.com> wrote:
>>>>>
>>>>> if you want the index rather than the coordinate values, then
>>>>>
>>>>> (1 i.~ f) y
>>>>>
>>>>> will "short circuit" to the first 1
>>>>>
>>>>> and
>>>>>
>>>>> ({~ 1 i.~ f)
>>>>>
>>>>> may be faster to get first coordinates than my original solution,
>> though
>>>> errors if there are no items with 1 = f
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Friday, October 21, 2022 at 12:55:41 p.m. EDT, 'Pascal Jasmin' via
>>>> Programming <programm...@jsoftware.com> wrote:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> }.^:(0 = f@{.)^:_
>>>>>
>>>>> will return the list with the head being the first f not equal 0.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Friday, October 21, 2022 at 12:19:41 p.m. EDT, Ed Gottsman <
>>>> edward.j.gotts...@gmail.com> wrote:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Hi. I’m blanking on something basic and research isn’t helping. When
>>>> the blindingly obvious solution is revealed I will blame a combination
>> of
>>>> sleep deprivation and senescence.
>>>>>
>>>>> I’ve got a long list of coordinates ordered by desirability. I want to
>>>> invoke f (a custom script) with each coordinate in turn. f may return 0
>>>> (failure), in which case I want to invoke it again with the next
>>>> coordinate. When f (eventually) returns 1, I want to terminate—the
>>>> remainder of the coordinates should not be processed. (Note that the
>> very
>>>> first invocation of f may return 1.)
>>>>>
>>>>> This *almost* feels like ^: in its Do While form. Almost. It also
>>>> feels like SCs around list operations (though they seem to be limited to
>>>> primitives).
>>>>>
>>>>> Help.
>>>>>
>>>>> Many thanks.
>>>>>
>>>>> Ed
>>>>>
>>>>> Sent from my iPad
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