Bill Allombert on Mon, 20 May 2013 17:08:36 +0200


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extremal case of component extraction 

Dear PARI developers,

In PARI 2.6.0 we have:

? [1,2][2..-2]
  ***   at top-level: [1,2][2..-2]
  ***                 ^------------
  *** _[_.._]: inconsistent dimensions in _[..].

? [1,2][2..1]
  ***   at top-level: [1,2][2..1]
  ***                 ^-----------
  *** _[_.._]: inconsistent dimensions in _[..].

I think a case could be made to return [] in both case.

On the other hand

? [1,2][3..1]

should probably fail.

Cheers,
Bill.