Invisible wrote:
> (I've never tried this extensively, but I would suggest that it probably 
> requires a little forethought before you start the calculation...)

Not too much. If you have the equation written down, the rule is that 
you type in the numbers in the order they appear, and you type in the 
operators as soon as you've gotten all the arguments for that operator.

Now, if it's not written down, it can take some head-twisting, but IME 
not any more than using infix. Certainly easier than using infix without 
parentheses built into the calcualtor.

-- 
Darren New / San Diego, CA, USA (PST)

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