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From: "James J. Weinkam" <j...@cs.sfu.ca>
Newsgroups: comp.lang.apl
Subject: Re: Code golf
Date: Mon, 24 Sep 2012 12:47:18 -0700
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david.dooner%upr....@gtempaccount.com wrote:
> All,
>
> If I am not mistaken, the original post provided the following link
>
> http://codegolf.stackexchange.com/questions/7036/print-custom-alphabet
>
> Is this the correct link with all the details?  If not, please share th=
e proper link.  If so, please share where inputs such as =E2=80=98s.z=E2=80=
=99 and =E2=80=98dc=E2=80=99 are not allowed.  Also, if a letter is not f=
ollowed by a period, please indicate where in the challenge that the numb=
er of characters displayed totals 49.
>
> Thanks,
> David
>
>
>
> On Sunday, September 23, 2012 7:54:06 PM UTC-4, James J. Weinkam wrote:=

>> Morten Kromberg wrote:>  On Saturday, 22 September 2012 23:44:16 UTC+2=
, James J. Weinkam wrote:>>  It looks to me as if your version will accep=
t invalid inputs such as 's.z' and 'Q '.>  >  Yes, I am not sure how stri=
ct the validation needs to be, perhaps I need to read the original proble=
m statement more carefully. I have looked at it, and the consensus is tha=
t valid input consists of a single upper or lower case alphabetic charact=
er optionally followed by a period. If the input is invalid, nothing what=
ever is to be displayed. If the input is valid the alphabet is to be disp=
layed in the same case as the input character, starting with the characte=
r following the input character and ending with the character just before=
 it in cyclic order. If a period was specified, each output character is =
to be displayed by itself on a separate line. If a period was not specifi=
ed, the 25 letters are to be separated by 24 spaces on a single line (49 =
characters in all).>  >>  Also, I don't understa
nd how the result of rotate becomes a 1 column matrix or where the decisi=
on to display as a row or column occurs.>  >  Turning the data into a 1 c=
olumn matrix is done by the monadic commabar (=E2=8D=AA - UCS 9066). The =
decision to display as a row or column is a result of padding each row wi=
th either space (UCS 32=3D13+19) or carriage return (UCS 13), before the =
final ravel.>  Aha! Another Dyalog feature I didn't know about; that make=
s four now - I learned about guards in dynamic functions, the commute ope=
rator, and the fact the squad can take a partial left argument from Aaron=
 Hsu's solution. I have downloaded a copy of the Dyalog Reference Manual =
and skimmed through it. I thought I had spotted most of the differences b=
etween Dyalog and APL2 but more keep cropping up. By the way, when I was =
struggling with guard, that fact that I didn't know what it was called co=
upled with the fact the ':' is not in the symbol index except as a label =
indicator made it hard for me to look it up myself. Thank
s to Aaron for pointing me in the right direction.
>
The statement of the challenge uses the phrase "separated by" not "follow=
ed by." Also, the challenge is accompanied by=20
examples of correct input and the required output. If you highlight the o=
utputs shown you will see that there are no=20
leading or trailing spaces in either format.