H Bjorn,
I agree that this can be done, but it isn't implicit and it adds
trappings of Computer Science that are a barrier to Mathematics teaching.
Don
> sqrsum =: 4 : '%:x + y'
> 3 sqrsum 5
> 2.82843
> 3 + 5
> %: 8
> %: 8
> 2.82843
>
>
> 2009/4/30 Don Watson <[email protected]>
>
>> Hi Don,
>>
>> You said:
>>
>> > Maybe I'm really missing something, but why use "[" and "]" at all?
>> > Just use "x" and "y".
>>
>> That's an interesting question. If I have the J expression:
>>
>> %:x + y
>>
>> and want to make a verb sqrsum, I could define a way of doing it -
>> that
>> doesn't presently exist exactly in this form - such that:
>>
>> sqrsum =: %:x + y
>>
>> or that:
>>
>> sqrsum =: %: [ + ]
>>
>> and that in either case:
>>
>> 3 sqrsum 5 is equivalent to: %: 3 + 5
>>
>> In the second case
>>
>> 1) I have a form that is full of nothing but verbs.
>> 2) I can state that the arguments are defined implicity.
>>
>> In the first case I need a convention that x and y are special
>> nouns used in named verbs with a special purpose. I obviously have nouns
>> as
>> well in this verb definition, and I think it is harder to suggest that
>> argument
>> inclusion is implicit.
>>
>> Don
>>
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>>
>
>
>
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