Condition on equation - 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: Condition on equation (/thread-12162.html) Condition on equation - EricR - 01-11-2019 02:14 PM Hi! I've just received my new HP Prime (latest model) and am very excited. I'm also new to this forum. But I'm not new to HP calculators, I have a HP 48 and a HP50g. Anyway, fiddling around with it, I was wondering whether there is a way to specify a condition on a formula in CAS mode. For example, if I want to add the condition x<1 before solving for x. Is that possible? RE: Condition on equation - Carlos295pz - 01-11-2019 02:55 PM With assume( ) and additionally( ) you can perform those actions RE: Condition on equation - informach - 01-11-2019 03:23 PM Hi!, EricR : Try with CASE, per example ... CASE IF A<0 THEN RETURN "negative"; END; IF 0≤A≤1 THEN RETURN "small"; END; DEFAULT RETURN "large"; END; See, from User Guide ... http://h10032.www1.hp.com/ctg/Manual/c05332710 RE: Condition on equation - EricR - 01-11-2019 05:05 PM Thanks a lot! assume() was what I was looking for. I've got to study the manual... RE: Condition on equation - informach - 01-12-2019 04:12 PM Hi!, EricR : You can use too ... IFTE Check, with ... https://en.hpprime.club/docs/reference/IFTE https://en.hpprime.club/articles/prime-tutorial-by-edward-shore-part-2/ RE: Condition on equation - Eddie W. Shore - 01-16-2019 01:46 PM How you would cancel an assume/additionally? RE: Condition on equation - Carlos295pz - 01-16-2019 02:26 PM purge() RE: Condition on equation - Arno K - 01-16-2019 02:26 PM As far as I know the only way is "purge(var)". Arno