On Dec 29, 7:50 am, Achim Passen <achim.pas...@gmail.com> wrote:
> Hi!
>
> I uploaded my attempt at this to the files section of this group:
> http://clojure.googlegroups.com/web/mod-sgn.diff
>
> It adds the modulus operator plus, as a by-product, the signum
> operator (sgn).
>
> Comments most welcome!
>
Thanks! Could you (and everyone) please submit patches as attachments
on the relevant issue?
I want to get away from patches in messages and in the files section.
Thanks,
Rich
>
> On 29 Dez., 07:01, Rich Hickey <richhic...@gmail.com> wrote:
>
> > On Dec 29, 12:44 am, "Mark Engelberg" <mark.engelb...@gmail.com>
> > wrote:
>
> > > So I understand that we're supposed to discuss ideas here to try to
> > > gain "mindshare" which is why last week I brought up the issue with
> > > Clojure missing mod (which works differently from rem on negative
> > > numbers). So really, no one else cares about this, or was the post
> > > just lost in the shuffle of holiday time?
>
> > > On Mon, Dec 22, 2008 at 4:04 AM, Mark Engelberg
>
> > > <mark.engelb...@gmail.com> wrote:
> > > > Anyone know why there is no modulo or mod function in Clojure's core?
> > > > I know there is a rem function, but that's not the same thing. mod
> > > > and rem behave differently when the first number is negative.
>
> > > > (mod -2 5) -> 3
> > > > (rem -2 5) -> -2
>
> > > > modulo n is important for making things stay in the range from 0 to
> > > > n-1, for example, if you're working with vectors of length n. You
> > > > need to ensure that negative numbers wrap around to the positive
> > > > range. rem does not do this.
>
> > > > I'm more familiar with Scheme than CL, and I know PLT Scheme provides
> > > > both modulo and remainder. But according to the Wikipedia
> > > > (http://en.wikipedia.org/wiki/Modulo_operation), Common Lisp also
> > > > provides both mod and rem functions. So why not Clojure? Is it a
> > > > Java defeciency?
>
> > Holidays here.
>
> > Feel free to create an issue for this:
>
> >http://code.google.com/p/clojure/issues/list
>
> > Patch (from a registered contributor) welcome.
>
> > Rich
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