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10.4: Be aware of a Calculator widget bug
Authored by: jlaro on Sep 30, '05 09:07:32PM

Actually, it's 19 vs 19 keystrokes, not 14 vs 28. For the RPN you forgot to count the ENTERs between values (otherwise 2 8 is 28), and for non-RPN there were too many parenthesis as you said (and the last one can be dropped because = closes it automatically).

I admit, I never used an RPN calculator before writing this post. The big difference seems to be that with RPN you have to memorize which groupings interact with which, and how, to put operations at the right place, whereas with the normal method the machine does it for you if you follow exactly the written equation (with SOMETIMES extra parenthesis to make sure the machine understands correctly).

Question to RPN experts, how would you enter the quadratic solutions (-b+SQRT(b^2-4ac))/2a and (-b-SQRT(b^2-4ac))/2a ? I tend to think that a lot of memorizing is necessary.
24-keystroke non-RPN example: ( - 2 + ( 2 x2 - 4 * 3 ± * 8 ) SQRT ) / ( 2 * 3 ± =

I guess it's just like reading sheet music, anybody can get used to anything.

(somehow ± can be shown here, but not the square root sign, hence my use of SQRT)



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