Problems with the command cumSum and Workaround - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html) +--- Forum: HP Prime (/forum-5.html) +--- Thread: Problems with the command cumSum and Workaround (/thread-3814.html) Problems with the command cumSum and Workaround - Eddie W. Shore - 05-11-2015 07:50 PM Example: store {10, 20, 10} to L1 cumSum(L1): sometimes returns {10, 40, Nan} sometimes returns {10, 30, 40} (the right answer) sometimes causes the calcualtor to crash Software Version 6975 Here is a possible workaround: CSUM(list) BEGIN LOCAL k; FOR k FROM 2 TO SIZE(list) DO list[k]:=list[k]+list[k-1]; END; RETURN list; END; CSUM({10,20.10}) returns {10,30,40} RE: Problems with the command cumSum and Workaround - Marcio - 05-11-2015 08:42 PM I couldn't reproduce the errors and the crash you're reporting! RE: Problems with the command cumSum and Workaround - JimS - 05-11-2015 08:54 PM Hi Eddie' I could not reproduce your error. Tried in HOME mode and CAS with various values in L1. RE: Problems with the command cumSum and Workaround - Terje Vallestad - 05-11-2015 09:04 PM eddie, I tried 20 times in CAS and same in Home but could not reproduce the error. Textbook setting, 6975 SW on the actual calculator. Cheers, Terje RE: Problems with the command cumSum and Workaround - StephenG1CMZ - 12-30-2017 05:17 PM One oddity I have just noted is that whereas cumSum normally returns a list, the built-in cumSum({}) returns numerical 0 instead - a result of a different type. I am not certain what the correct result should be, but I would expect/hope for either {} or {0}, not 0. RE: Problems with the command cumSum and Workaround - parisse - 12-30-2017 07:13 PM I have implemented cumSum for TI compatibility, and it returns 0 for an empty list.