Programming puzzles: processing lists!

[StephenG1CMZ]

(12-30-2017 02:39 PM)pier4r Wrote:  Just discovered, thanks to the work of Terje here (I wonder why HP does not release a pdf with the prime help. It would make things way easier, especially for search and bookmarking) that #41 on the prime can be done with the function cumSum.

The more I look into the prime, the more I see a quite extended standard library of commands.

One oddity I just noticed was that cumSum({}) returns 0...
Many built-ins don't handle empty lists well.
But what should the answer be?
{} means you can distinguish input {} from input {0} if desired
Whereas
{0} treats {} as {0}, just like my ListSigmaSum procedure (whereas the builtin SigmaSum fails).
I am thinking returning {0} would be better, assuming there is no good reason to return 0.

Eddie W Shore has a workaround for some other oddities here:
http://www.hpmuseum.org/forum/thread-381...ght=cumSum