When I change into engineering/scientific mode with a precision of e.g. 1 digit, '70E9 *cos(0)' gets simplified into 1/e^16 (cas is set to exact). What is going on here?
Simplify with sci/eng on hp 50g

11062012, 04:38 AM
11062012, 05:37 PM
I am unable to reproduce your error. I get 7.0E8 A couple of questions: In the answer, is that e the normal (2.71828...) e? Do you have E defined to be a variable with a value? Can you explain *exactly* what you're doing? Example, I am in RPN mode, enter 70E9 *cos(0) in single quotes, and hit EVAL (or simplify, whatever) and get 7.0E8
11062012, 06:37 PM
Set mode to engineering with precision 1, cas mode exact. Open equation editor, enter cos(0) * 0.01 (another example). Select whole expression and simplify it, or close the equation editor and invoke SIMPLIFY (EVAL does not exhibit this behaviour). It gets simplified to 1/e^5 (yes, that's e, the exponential function).
11062012, 06:50 PM
I have made a recording of this in the emulator: http://www.mediafire.com/?9cnml3z1c3yvhw8
11072012, 06:15 AM
Hi Juraj,
Edited: 7 Nov 2012, 6:48 a.m.
11072012, 10:56 AM
In approx mode, 1•0.01 gets simplified right into 6.7E3. This is really dangerous! How the hell did not anyone discover this earlier? That was on my 3rd or 4th day of owning a 50g.... Edited: 7 Nov 2012, 10:59 a.m.
11072012, 11:25 AM
How do you do ? In RPN mode I get the right answer
11072012, 11:39 AM
Quote:Hi Gilles, v2.09 does get the right answer, but v2.15 gets the answer that Juraj noted. (we are talking about SIMPLIFY command with low digit ENG/SCI/FIX mode). Edited: 7 Nov 2012, 11:52 a.m.
11072012, 11:44 AM
Quote:I guess most users like lots of numbers and do not normally use the SIMPLIFY function with such low digit requirements. Quote:It still seems to try and use the Exact techniques (in Exact mode it gives 1/e^5, which = 6.7E3 with "> NUM" in FIX 1). When entering it as '1·(1/100)' the correct answer is produced. It seems to try and find the nearest answer representable with e. I tried several flag settings, but nothing seems to help. Perhaps others have better ideas. As I said, it seems something here broke between v2.09 and 2.15.
Edited: 7 Nov 2012, 12:06 p.m.
11082012, 10:34 AM
Interesting. I tested this on a emulator, though, which would have been an older version. I left my physical HP50g at home, so I'll have to check this on that later.
11082012, 06:26 PM
I can also confirm this behavior on the HP50G ROM 2.15 Han
11162012, 07:24 PM
Quote: It looks like my physical calculator does have this issue. Maybe I should try to install an older version? 
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