When you changed your example from [3,4,0,9] to [3,4,5,9] it was not the removing of the zero entry that made RemoveSet work.
It was the fact that your second example was a *sorted* list that made it work. (As already suggested, Filtered will do the job, but it returns a new copy of the filtered list and does not affect the existing list) From: Arkadiusz Bochniak <arkadiusz.bochn...@doctoral.uj.edu.pl> Date: Friday, 7 May 2021 at 3:07 am To: forum@gap-system.org <forum@gap-system.org> Subject: [GAP Forum] Removing zeros from a list Error, RemoveSet: <set> must be a mutable proper set (not a non-strictly-sorted plain list The same problem appeared when I tried to remove 9. On the other hand, when the list does not contain zeros there is no such a problem (e.g. it works perfectly for s := [3,4,5,9];; and RemoveSet(s,9); s;). What is the reason for that? How to fix it in order to be able to remove zeros from a given list? _______________________________________________ Forum mailing list Forum@gap-system.org https://mail.gap-system.org/mailman/listinfo/forum
