IFTE odd behaviour

[rprosperi]

(10-11-2019 05:36 PM)rprosperi Wrote:  

(10-11-2019 11:09 AM)Tim Wessman Wrote:  Second may be a bug (not sure, would have to check the code), but the third is perfectly expected and as designed. It is doing list processing on your input.

Try IFTE({1,0,1,0,0),2,3) and what do you get?

Assuming this should be IFTE({1,0,1,0,0},2,3), I'd guess {2,3,2,3,3} ?

So I dug out my Prime to check (the suspense was killing me) and have mixed results:

In HOME, my guess was right, {2,3,2,3,3} so I understand that at least;

But in CAS, Prime replies "when({1,0,1,0,0},2,3)", though it also adds the simplify button, daring me to pursue it further. Figuring it can't hurt to try, it then replies "simplify(when({1,0,1,0,0},2,3)) => when({1,0,1,0,0},2,3)"

So, 2 conclusions - In CAS, I guess that is as simple as it gets, and I still don't understand the Prime's split personality.

Can anyone explain:

1. The CAS behavior, and meaning of that result
2. Why they are different? I'd assume IFTE() works the same in both modes - there is no mention of either mode in the online help and this command is not in the manual at all.