--- Joey K Tuttle <[EMAIL PROTECTED]> wrote:
> At 08:14 -0700 2007/09/14, Ed Keith wrote:
> >I'm coming to J from a C++ background. While much of J
> >requires a new mind set, I think I am getting most of
> >it, but I'm just not getting tacit programming. I
> >cannot figure out anything that is not trivial.
> >
> >For example I recently wrote the following verb:
> >
> >base =: dyad : '((<. 1 + y ^. x) # y) #: x'
> >
> >It takes a number and a base and and produces an array
> >of digits to represent the number in the base.
> >
> >How would this be written tacitly? I'm not so much
> >interested in how to write this verb, but how to think
> >through the creation of a tacit verb.
> >
> >Any assistance is appreciated,
> >
>
> One way (but without thinking...) -
>
> 13 : '((<. 1 + y ^. x) # y) #: x'
> [ #:~ ] #~ [: <. 1 + ^.~
Check out the hand-coded variant in previous post,
which turns out to be amazingly the same.
> base=: [ #:~ ] #~ [: <. 1 + ^.~
--- Oleg Kobchenko <[EMAIL PROTECTED]> wrote:
> This is an interesting question: how would
> 4 #. 3 2 1 NB. test case
> 57
>
> 57 (^.~) 4 NB. incremental
> 2.91645
> 57 (1 + ^.~) 4
> 3.91645
> 57 ([: <. 1 + ^.~) 4
> 3
> 57 (] #~ [: <. 1 + ^.~) 4
> 4 4 4
> 57 ([ #:~ ] #~ [: <. 1 + ^.~) 4
> 3 2 1
>
> NB. new name
> base=: [ #:~ ] #~ [: <. 1 + ^.~
> 57 base 4
> 3 2 1
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