Hi, Stu,
Loving your book!
I posted a reply earlier, through a different interface, which went
to "moderators". Sorry for the clumsiness, but I'm not familiar with
the mechanics of newsgroups.
On Sep 11, 7:28 am, Stuart Halloway <stuart.hallo...@gmail.com> wrote:
> The consing version of ev-stream is self-referential, because you explicitly
> made it so by consing it back onto itself. So it only has two items in it,
> though it bounces back and forth between them forever. The cycling version is
> not self-referential.
Since it's the self reference that gives the nice results (finite
memory consumption, and apparently better speed), I came up with a
little macro to provide it:
(defmacro defcycle [name coll]
`(def ~name (lazy-seq (concat ~coll ~name))) )
This is probably not the most useful way to do it, since the user has
to provide name.
> > Now I'll test it with 9876543210, a number which "ev?" was able to
> > handle:
>
> > user=> (time (mod3 9876543210))
> > "Elapsed time: 37759.615 msecs"
> > 1
> > user=> (mod 987654321 3)
> > 0
>
> > Whoa! The computation finished in reasonable time, but with the WRONG
> > answer! How did that happen?
> > Did I find a bug?
>
> No, there is simply a typo in your input arg.
with the typo fixed, i.e. (mod 9876543210 3), the result is still 0.
regards,
George
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