Something weird happens.
When I compile

aggcat.spad from my "fix/elt-universalsegment" branch.

https://github.com/hemmecke/fricas/commits/fix/elt-universalsegment

https://github.com/hemmecke/fricas/blob/fix/elt-universalsegment/src/algebra/aggcat.spad#L2363

It start like this...

   elt(x : %, seg : UniversalSegment(Integer)) ==
       dbgPrint("seg", seg)
       lo := low(seg) - minIndex x
       dbgPrint("low seg", low(seg))
       dbgPrint("hig seg", high(seg))
       dbgPrint("inc seg", incr(seg))

then I get the following output

(80) -> elt(l, (5..) by 5)
[:> , seg, 5 ..  by 5]
[:> , low seg, 5]
[:> , inc seg, 5]

   (80)  [5, 10, 15, 20]
                                       Type: List(Integer)

which is OK.

But look at the stepsize here. Why is it 1 and not 5?

(81) -> elt(l, (5..14) by 5)
[:> , seg, 5 .. 14]
[:> , low seg, 5]
[:> , hig seg, 14]
[:> , inc seg, 1]


(82) -> u

   (82)  4..18 by 3
                            Type: Segment(PositiveInteger)
(83) -> incr u

   (83)  3
                                  Type: PositiveInteger
(84) -> l(u)
[:> , seg, 4 .. 18]
[:> , low seg, 4]
[:> , hig seg, 18]
[:> , inc seg, 1]

Ralf

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