Torture tests: what do they mean?

[jebem]

(05-17-2014 06:53 AM)Joe Horn Wrote:  

(05-16-2014 08:52 AM)jebem Wrote:  HP-Prime in CAS mode result: 400
HP-Prime Home mode: 0
Correct mathematical result: 720.

Please note that this wasn't really done in "Exact/CAS mode" as requested. The decimal point in the 7.2 forces Prime to evaluate the whole thing in approximate mode, not exact mode. If you really want to evaluate that expression in Exact/CAS mode, you must use 72/10 (or any other exact equivalent of 7.2, e.g. 7+1/5) instead of 7.2 with a decimal point in it. If you do that, you'll get the correct answer of 720 in Exact/CAS mode.

Hi Joe, Thanks a lot for your input on this theme.
Yes, I still believe in my beloved HP-Prime. as Dieter and others pointed out, the tool is not guilty per se, so one need to understand it first before taking full advantage of the machine.
It is always a pleasure to read your posts, despite that I can't always follow your mathematical expertize due to my lack of math theory background. But I'm learning... And this is not intended to worship you, it is just what I feel about it.