Also,
{. , 34
is a simple way to convert a vector to a scalar, or, for higher-ranked arrays,
({.@:,) .
On Sun, May 6, 2012 at 2:52 AM, Roger Hui <rogerhui.can...@gmail.com> wrote:
> You can do this the same as you do in APL, ''$,34.
>
> I remember discussing this with Fred Appleyard when I was a summer student
> in IPSA Calgary in 1975. I opined that you "can not make a scalar from a
> vector". He immediately showed me ''$,34, (,34)[0], +/,34, etc.
>
>
>
> On Sat, May 5, 2012 at 11:46 PM, Linda Alvord <lindaalv...@verizon.net>wrote:
>
>> J Vocabulary, Primer, Single atom array
>>
>> An array with a single atom is referred to as a singleton. All singletons
>> with the same atom display the same way. However, the fact that they have
>> different ranks affects how verbs act on them. This can be a pitfall for
>> beginners. It is important to remember that if it displays like an atom,
>> but
>> does not behave like one, then check its rank.
>>
>> Is there somewhere in the vocabulary where it mentions how to change a
>> single element list to an atom (shape 1 to shape empty)
>>
>> $34
>> $,34
>> 1
>> #34
>> 1
>> #,34
>> 1
>>
>> Isn't the problem with shapes rather than rank?
>>
>> In any case, I have a mental lapse and can't seem to change ,34 to 34 .
>>
>> Thanks in advance.
>>
>> Linda
>>
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>>
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--
Devon McCormick, CFA
^me^ at acm.
org is my
preferred e-mail
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