Very good!
I guess we need more of such easy introductions.
2009/2/23 Alex Rufon <[email protected]>
> Hi Guys,
>
> I would just like to suggest as looking at this in a different
> perspective.
>
> I have a few/limited success in teaching J using the standard symbols
> but I do have a better success in teaching J with the "primitives"
> add-on. Of course the there are dis-advantages and the most glaring one
> is the loss of tacit programming.
>
> foo=: monad define
> NB. Look at the following while turning off your J knowledge
> NB. Create 2 copies of a 10 by 5 integer
> data=. 2 copy integers 10, 5
> NB. Create a new command which would sum a table
> sumtable=. plus table
> NB. Get the primary key, first column
> primarykey=. 1 take rank 1 data
> NB. Remove the primary key
> data=. drop rank 1 data
> NB. get the total value by each key
> sumdata=. (nub primarykey) stitch primarykey sumtable key data
> )
>
> fubar=: 3 : 0
> data=. 2 #i. 10 5
> primarykey=. 1 {."1 data
> sumdata=. (~. primarykey),. primarykey +/ /. }. "1 data
> )
>
> But if you would take into consideration me teaching 10 programmers J
> using primitives add-on and all of them remembered a few of the commands
> in comparison to teaching 10 programmers using J notation and 8 to 9 of
> the students walking away confused. So if your objective is to teach, I
> would start them with general concepts and use the "primitives" addon
> then later on ... for advance topics, you slowly introduce the actually
> J notation. It works for me.
>
> I believe somebody else here has done this too (just forgot who he is).
>
> r/Alex
>
>
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
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