On 5/23/07, Henry Rich <[EMAIL PROTECTED]> wrote:
The idea can be put many ways. Here's one:
x&u y
should be more common or useful than
x u&y
So, in x | y, x is the modulus because you are more likely to
take the remainder of a bunch of numbers with the same modulus
rather than remainders of the same number with different moduli.
The rule comes about because x u^:_1 y is defined as (x&u)^:_1 .
% e. -. (and arguably -) are defined incorrectly according to this rule,
and
in each case the reason is conformance to pre-J mathematical
notation.
So we appear to have an admission that APL & J broke with MANY conventions,
BUT:
it was not the case that they were entirely _consistent_ in doing so.
Henry Rich
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of R.A. MacDonald
> Sent: Wednesday, May 23, 2007 2:34 PM
> To: General forum
> Subject: Re: [Jgeneral] Why does the Residue function take
> its arguments in"reverse" order
>
> Hello Terrence;
>
> Given that this ordering is as old as APL, thus as old as I
> am, and I do
> not recall having seen an explanation, I would also be
> interested in one.
>
> A thought: the #: (Antibase) verb follows the same pattern,
> as did APL's
> decode (or was it encode? dualities always throw me) with a
> default left
> argument of 2 in the monadic case. It sctually returns the
> same result
> when the left argument is a scalar:
>
> 3 #: 10
> 1
> 3 | 10 NB. Veery intestingk.
> 1
>
> Nitpicky questions are the new poster's job. If you want negative
> reactions to a novice, ask a Perl "monk" a question.
>
> Terrence Brannon wrote:
> > It seems that the Residue function should follow the same
> argument order as %
> >
> > It does not seem consistent or intuitive for the arguments
> to be reversed.
> >
> > What motivated this decision? I spent 5 minutes about to
> tear my hair out trying
> > to figure out the results I was getting from Residue.
> >
> > 7 % 2
> > 3.5
> > 2 | 7 NB. would be 7 | 2 if I were designing J :)
> > 1
> >
> >
> > I'm sorry to ask what seem like such nitpicky little
> questions, but I got a
> > great answer regarding Passive, so perhaps I am just
> ignorant of some loftier
> > motivation for such argument calling conventions.
> >
> >
> >
> ----------------------------------------------------------------------
> > For information about J forums see
> http://www.jsoftware.com/forums.htm
> >
> >
>
> --
> later ...
> <pre>---------------------------------------------------------
> ---------------
> |\/| Randy A MacDonald | APL: If you can say it, it's done.. (ram)
> |/\| [EMAIL PROTECTED] |
> |\ | | The only real problem with APL is that
> BSc(Math) UNBF'83 | it is "still ahead of its time."
> Sapere Aude | - Morten Kromberg
> Natural Born APL'er | Looking for a whip-smart APL
> developer <a href="mailto:[EMAIL PROTECTED]">Send me a note</a>
> -----------------------------------------------------(INTP)---
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>
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> For information about J forums see
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