Re: issue with circular lists

2020-12-23 Thread Davide BERTOLOTTO 
Thanks for the clarification Alex! The ulimit command did the trick.

Cheers,
Davide

On Wed, Dec 23, 2020, 14:16 Alexander Burger  wrote:

> On Wed, Dec 23, 2020 at 01:57:10PM +0100, Alexander Burger wrote:
> > The result is a little different though:
> >
> >: (let L NIL (for I 7 (fifo 'L I)) L)
> >-> (7 1 2 3 4 5 6 .)
>
> .. but of course the fix is trivial :)
>
>: (cdr (let L NIL (for I 7 (fifo 'L I)) L))
>-> (1 2 3 4 5 6 7 .)
>
> ☺/ A!ex
>
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Re: issue with circular lists

2020-12-23 Thread Alexander Burger 
On Wed, Dec 23, 2020 at 01:57:10PM +0100, Alexander Burger wrote:
> The result is a little different though:
> 
>: (let L NIL (for I 7 (fifo 'L I)) L)
>-> (7 1 2 3 4 5 6 .)

.. but of course the fix is trivial :)

   : (cdr (let L NIL (for I 7 (fifo 'L I)) L))
   -> (1 2 3 4 5 6 7 .)

☺/ A!ex

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Re: issue with circular lists

2020-12-23 Thread Alexander Burger 
On Wed, Dec 23, 2020 at 01:35:58PM +0100, Alexander Burger wrote:
> > (eval (cons 'circ (range 1 20)))
> Yes, this is a known issue. It is a stack overflow.

Building a long list with 'range' just to apply it (e.g. to 'circ') is rather
inefficient.

In this case, I would recommend 'fifo' to build large circular structures:

   (let L NIL
  (for I 20
 (fifo 'L I) )
  ...


The result is a little different though:

   : (let L NIL (for I 7 (fifo 'L I)) L)
   -> (7 1 2 3 4 5 6 .)

Depends on the use case.

☺/ A!ex

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Re: issue with circular lists

2020-12-23 Thread Alexander Burger 
Hi Davide,

> Just found out that it is an issue with apply. Probably the number of
> arguments is too large.
> 
> (eval (cons 'circ (range 1 20)))

Yes, this is a known issue. It is a stack overflow.

'apply' builds structures on the stack.

The recommended way is to set

   ulimit -s unlimited

in your .bashrc

☺/ A!ex

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Re: issue with circular lists

2020-12-23 Thread Davide BERTOLOTTO 
Just found out that it is an issue with apply. Probably the number of
arguments is too large.

(eval (cons 'circ (range 1 20)))

Works fine.

Could someone confirm please?

Regards
Davide

On Wed, Dec 23, 2020, 13:16 Davide BERTOLOTTO 
wrote:

> Hi everyone,
>
> I had recently an issue with both pil64 and pil21. I was trying to create
> a large circular list and got a segmentation fault with a size of >200'000
> elements. Is that expected?
>
> (apply circ (range 1 20))
>
> Regards,
> Davide
>

issue with circular lists

2020-12-23 Thread Davide BERTOLOTTO 
Hi everyone,

I had recently an issue with both pil64 and pil21. I was trying to create a
large circular list and got a segmentation fault with a size of >200'000
elements. Is that expected?

(apply circ (range 1 20))

Regards,
Davide