[ruby-talk:03885] Re: modulo and remainder

Hi,

Judi Roy / Camile Hamel wrote:

> ----- Original Message -----
> From: "Yukihiro Matsumoto" <[e-mail]>
> To: "ruby-talk ML" <[e-mail]>
> Sent: Monday, July 03, 2000 10:44 PM
> Subject: [ruby-talk:03787] Re: modulo and remainder
>
> > Hi,
> >
> > In message "[ruby-talk:03779] Re: modulo and remainder"
> >     on 00/07/04, Tadayoshi Funaba <[e-mail]> writes:
> >
> > |I wrote a method jd_to_wday in date2.rb like this:
> > |
> > |    def jd_to_wday(jd) (jd + 1) % 7 end
> > |
> > |It calculates the day of week of the given the Julian day number.
> > |I used % and it must be modulo.  So it works even if jd is -ve.
> >
>
> >
> > It reflects the author's weakpoint.  Even if you don't need that
> > (weakness in mathematical field?), I can't do the right thing without
> > YOUR help.  Enlighten me, please.
> >
> > matz.
>
> Hi,
>
> I'm very much a newbie programmer and don't pretend to be able to follow
> most of the postings.
> Am I right in assuming matz is looking for mathematical info on 'modulo' and
> 'remainder'

I'm somewhat puzzled about that.

This was a fairly recent topic of discussion (within the last few weeks/months
or so) where people presented a fair amount of information and argumentation on
just this topic. I didn't realize that the implementation choice questions
hadn't been settled. I was just reiterating a previously made remark from that
discussion.

--
Conrad Schneiker
(This note is unofficial and subject to improvement without notice.)