[Jprogramming] statistical induction

[Björn Helgason]

I try to use =. when I can so I do not forget to make names local.

In a script while testing before putting the line into a verb it is easy to
send either one line at a time with ctrl+r or several lines with ctrl+e

These kinds of names I do not want to have as globals in a system.

2011/10/4 Raul Miller <rauldmiller at gmail.com>

> On Tue, Oct 4, 2011 at 4:52 AM, Bo Jacoby <bojacoby at yahoo.dk> wrote:
> > Verbs for deduction and induction are defined like this.
> >
> >    a     =. *`%`:3"2
> >    b     =. ,: (%:@* -.)
> >    c     =. (,: , 1:) % +/@]
> >    deduc =. a at b@c f.
> >    T     =. -@(+ #)
> >    induc =. (T@}: , }.)@(T~ deduc T) f.
>
> This looks fun.
>
> I do have some cosmetic suggestions.
>
> First, I prefer =: over =. for definitions that I am going to use,
> because =. definitions in a script I load from file vanish before I
> can use them.
>
> Second, I would probably use / instead of `:3 -- I know that J will
> convert gerund/ to gerund`:3 but / is still more concise (and, for me,
> saves a round trip to the vocabulary page -- but that might not be the
> case for someone else).
>
> Also, it's interesting (and educational) to try to put names to each
> of the intermediate results that arise in this kind of computation.
>
> --
> Raul
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>



-- 
Björn Helgason, Verkfræðingur
Fornustekkum II
781 Hornafirði,
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http://groups.google.com/group/J-Programming


Tæknikunnátta höndlar hið flókna, sköpunargáfa er meistari einfaldleikans

góður kennari getur stigið á tær án þess að glansinn fari af skónum
          /|_      .-----------------------------------.
         ,'  .\  /  | Með léttri lund verður        |
     ,--'    _,'   | Dagurinn í dag                     |
    /       /       | Enn betri en gærdagurinn  |
   (   -.  |        `-----------------------------------'
   |     ) |         (\_ _/)
  (`-.  '--.)       (='.'=)   ♖♘♗♕♔♙
   `. )----'        (")_(") ☃☠