I think he means this by "mixing +ve and -ve":
0 1 _2 _1 { i.10
0 1 8 9
On Tue, Sep 2, 2014 at 2:50 PM, Joe Bogner <[email protected]> wrote:
> I also use { extensively (dyadic). I appreciate the challenge of
> coming up with a minimal list. One criteria may be: can it be done
> relatively easily with one of the other operations?
>
> For {, it's fairly easy to use {. and }....
>
> For example: {. 3 }. 0 1 2 3 4 5
>
> With a trivial case, the performance is negligible, but perhaps not as
> readable
>
> 100 timespacex '{. 9999999 }. i. 1e7'
> 0.0248935 1.3422e8
>
> 100 timespacex '9999999 { i. 1e7'
> 0.0269468 1.3422e8
>
> I mostly use it for simple indexing. I didn't understand your comment
> about mixing +ve and -ve. Can you elaborate?
>
> [by the way, excellent list Devon. I may use it to extend my
> coffeescript implementation of APL to have functioning examples for
> each of those operations]
>
>
>
> On Tue, Sep 2, 2014 at 2:39 PM, Vijay Lulla <[email protected]> wrote:
> > Just out of curiosity, why is { not included? I use it extensively for
> my J
> > explorations. Also, it is much more regular and useful(flexible?) than
> > indexing in other languages. For e.g., You cannot mix +ve and -ve indexes
> > in R but it works as expected (at least for me) in J. Regardless, nice
> work.
> >
> > Thanks,
> > Vijay.
> >
> >
> > On Tue, Sep 2, 2014 at 1:16 PM, Devon McCormick <[email protected]>
> wrote:
> >
> >> Based on Skip's suggestion, this page is now here -
> >> http://www.jsoftware.com/jwiki/DevonMcCormick/MinimalBeginningJ - and
> is
> >> titled "Minimal J for Beginners".
> >>
> >>
> >> On Tue, Sep 2, 2014 at 1:10 PM, Devon McCormick <[email protected]>
> >> wrote:
> >>
> >> > Good point - I picked up the "J Kernel" label from the discussion.
> >> >
> >> >
> >> > On Tue, Sep 2, 2014 at 12:36 PM, Skip Cave <[email protected]>
> >> > wrote:
> >> >
> >> >> Devon, nice job of putting together a reduced set of primitives for
> rhe
> >> >> beginner. The only issue I see is the name. As a beginner, I would
> never
> >> >> think to find a set of most-commonly-used primitives under the name
> "J
> >> >> Kernel" That actually sounds like a discussion of the internals of J,
> >> >> which
> >> >> is what I thought when I read the subject of your email. I doubt
> that a
> >> >> beginner would check out a page with that label. A title like "J's
> Basic
> >> >> Commands for Beginners" or equivalent, would be more likely to
> attract
> >> the
> >> >> intended audience.
> >> >>
> >> >> Skp
> >> >>
> >> >> Skip Cave
> >> >> Cave Consulting LLC
> >> >>
> >> >>
> >> >> On Tue, Sep 2, 2014 at 9:54 AM, Devon McCormick <[email protected]>
> >> >> wrote:
> >> >>
> >> >> > Based on some feedback from Greg Borota last year on his
> experiences
> >> >> > learning J, I've put together a page on the J Wiki -
> >> >> > http://www.jsoftware.com/jwiki/DevonMcCormick/JKernel - that has a
> >> few
> >> >> > selected things from J on which a beginner can concentrate to avoid
> >> >> being
> >> >> > overwhelmed by the language in full.
> >> >> >
> >> >> > It's a pretty bare minimum and I couldn't find a good link that
> >> explains
> >> >> > J's use of single quote for quoted strings but everyone should feel
> >> >> free to
> >> >> > add to it - sparingly, as it's supposed to be a reduced set of the
> >> >> > language.
> >> >> >
> >> >> > It might make sense to leave the existing page much as it is and to
> >> >> think
> >> >> > about a 2nd tier of slightly more advanced verbs and such. There
> were
> >> >> good
> >> >> > suggestions in the original discussion -
> >> >> >
> >> >> >
> >> >>
> >>
> http://jsoftware.2058.n7.nabble.com/Learning-J-language-initial-thoughts-td52786.html#a52793
> >> >> > - that I elided as I consider them more than the bare minimum
> (things
> >> >> like
> >> >> > rank modifiers and logic verbs).
> >> >> >
> >> >> > --
> >> >> > Devon McCormick, CFA
> >> >> >
> ----------------------------------------------------------------------
> >> >> > For information about J forums see
> >> http://www.jsoftware.com/forums.htm
> >> >> >
> >> >>
> ----------------------------------------------------------------------
> >> >> For information about J forums see
> http://www.jsoftware.com/forums.htm
> >> >>
> >> >
> >> >
> >> >
> >> > --
> >> > Devon McCormick, CFA
> >> >
> >> >
> >>
> >>
> >> --
> >> Devon McCormick, CFA
> >> ----------------------------------------------------------------------
> >> For information about J forums see http://www.jsoftware.com/forums.htm
> >>
> > ----------------------------------------------------------------------
> > For information about J forums see http://www.jsoftware.com/forums.htm
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
--
Devon McCormick, CFA
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
