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Re: [TeXmacs] Scheme in TeXmacs: is the find function supported?


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  • From: Frank <address@hidden>
  • To: address@hidden
  • Subject: Re: [TeXmacs] Scheme in TeXmacs: is the find function supported?
  • Date: Wed, 5 Jun 2019 11:03:55 +0200
Hello,

I believe that implementing find procedure by hand is a better option.

> (define (find proc list)
>     (define (find-iter head)
>       (cond
>         ((null? head) #f)
>         ((proc (car head)) (car head))
>         (else (find-iter (cdr head)))))
>     (find-iter list))

The filter procedure costs asymptotically more time on average (and probably more space, depending on the implementation).

Best wishes,

Le 04/06/2019 à 23:19, Giovanni Piredda a écrit :
I need to become acquainted with the different standards :-) (I checked Guile without realizing that I was checking a different version).

I used the filter function in place of it.


G.

On 04.06.19 23:06, Massimiliano Gubinelli wrote:
You expect the procedure find to be defined in Guile? I just checked and even from the REPL on the command line such function does not belong to Guile 1.8. Not all schemes implement the same language. In  particular you cannot expect procedures which are not requested by the R5RS standard since Guile 1.8 is essentially based on that.
Best
Max


On 4. Jun 2019, at 22:19, Giovanni Piredda <address@hidden> wrote:


On 04.06.19 22:18, Giovanni Piredda wrote:
Dear all,

did anyone ever used the find function in the Scheme implementation used in TeXmacs? It gives me a "Unbound variable: find" error. I can run the same code from emacs (using MIT-GNu Scheme).


I mean the same code which is giving an error inside TeXmacs

--
Best wishes!
Yours,


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