On 21/01/2019 21:01, Neil Van Dyke wrote:
Hi,
>
> That's an improper end to a list. It means a structure of pairs in
> which the CDR (right element) of the last pair is not the null list.
>
Thanks again for your detailed and pedagogic answer.
I have replaced 'cons' by 'list' and it is ok.
On 20/01/2019 15:33, Neil Van Dyke wrote:
[lot of helpful information]
OK, it works now. I could finally strip it down to
(define (enum-var-dim n v)
(if ( = n 2)
(cons (fst (cantor-enum v)) (snd (cantor-enum v)))
(cons (fst (cantor-enum v))(enum-var-dim (sub1 n) (snd
(cantor-enum v))
Hi,
Thanks you very much for these very detailed explanations. It helped me
a lot.
Thank you again,
Alain
On 20/01/2019 15:33, Neil Van Dyke wrote:
>
> netraken wrote on 1/20/19 8:31 AM:
>> (define (EnumVarDim n value result)
>> (if ( >= n 2)
>> ( (d
On 20/01/2019 19:50, Jonathan Simpson wrote:
> Are you looking for the values function?
>
> https://docs.racket-lang.org/reference/values.html?q=values#%28def._%28%28quote._~23~25kernel%29._values%29%29
>
> In your example you'd end EnumTriplet with this:
>
> (values x y z)
>
Yes, that's it.
Hello Neil,
Thanks for your help.
On 20/01/2019 13:54, Neil Van Dyke wrote:
> Hello, Alain. You might wish to write out htdp.org design recipes for
> EnumVarDim and Enum.
Yes it seems that this is an useful reference for learning. Thanks for
pointing it.
I don't know what they're supposed to
Hello all,
I am a beginner in Racket.
I need to define a variable pairValue as the result of Enum(result)
The following function
;; Fonction inverse en dimension variable
(define (EnumVarDim dim value result)
(if ( >= dim 2)
( (define pairValue Enum(result)))
(result)))
fails with
"defi
Hi all,
I am an absolute beginner in Racket.
I wrote the following function which deals with Cantor pairing function.
(define (EnumTriplet n)
(define inter (Enum n))
(define z (fst inter))
(define result (Enum (snd inter)))
(define x (fst result))
(define y (snd result))
x
;;y
;;z
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