2012/2/24 Linda Alvord <lindaalv...@verizon.net>:
> I used infix and got your rt . But here is what I don't understand.
> What is going on in a ? If I remove _ it doesn't work. When it is
> there I can't figure out what you've done.
>
> a=: 13 :'(i.#y)}."0 _ sh y'
> a 'abcde'
> cbaed
> baed
> aed
> ed
> d
#'cbaed'
5
i.#'cbaed'
0 1 2 3 4
0 1 2 3 4 }."0 _ 'cbaed'
cbaed
baed
aed
ed
d
If you are trying to see how rank applies to arguments, it's often
handy to replace the verb with something that boxes them -- for
example, (;)
0 1 2 3 4 ;"0 _ 'cbaed'
┌─┬─────┐
│0│cbaed│
├─┼─────┤
│1│cbaed│
├─┼─────┤
│2│cbaed│
├─┼─────┤
│3│cbaed│
├─┼─────┤
│4│cbaed│
└─┴─────┘
So, here, in ("0 _), (0) means "use a single number from the left
side", and (_) means "use the entire right argument" when constructing
arguments to (}.)
--
Raul
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