[Rd] Computer algebra in R - would that be an idea??

Robin Hankin r.hankin at noc.soton.ac.uk
Fri Jul 15 15:30:46 CEST 2005

Just a note to point out that Martin's R implementation of APL's  
"take" function
was pretty neat.   Could we preserve it for posterity somewhere in the R
distribution?  Failing that, it would complement subsums() of the  
magic package
very nicely.

<mustn't flame APL....[holds head].....no flaming allowed........>

best wishes


On 15 Jul 2005, at 14:14, Martin Maechler wrote:

>>>>>> "bry" == bry  <bry at xdocs.dk>
>>>>>>     on Fri, 15 Jul 2005 14:16:46 +0200 writes:
>     bry> About a year ago there was a discussion about interfacing  
> R with J on the J
>     bry> forum, the best method seemed to be that outlined in this  
> vector article
>     bry> http://www.vector.org.uk/archive/v194/finn194.htm
> (which is interesting to see for me,
>  if I had known that my posted functions would make it to an APL
>  workshop...
>  BTW: Does one need special plugins / fonts to properly view
>      the APL symbols ? )
>     bry> and use J instead of APL
>     bry> http://www.jsoftware.com
> well, I've learned about J as the ASCII-variant of APL, and APL
> used to be my first `beloved' computer language (in high school!)
> -- but does J really provide computer algebra in the sense of
> Maxima , Maple or yacas... ??
> (and no, please refrain from flame wars about APL vs .. vs ..,
>  it's hard to refrain for me, too...)
> Martin Maechler, ETH Zurich
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Robin Hankin
Uncertainty Analyst
National Oceanography Centre, Southampton
European Way, Southampton SO14 3ZH, UK
  tel  023-8059-7743

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