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To top it all off, actually punching all those keystrokes into real calculators showed that RPN was more accurate. The infix guy, on the other hand got badly bogged down, backed up several times and ultimately gave up after his RPN competitor had been watching him struggle for five minutes. Two more stepped up to try and, once again, the RPN user wrote down keystrokes in a long list, without any more hesitation than it took to find his place in the expression. It had fractions nested at least ten layers deep and was, frankly, ridiculous. Then someone (I think it was actually someone from the RPN camp) decided to write a truly horrendously complex expression. The RPN user consistently finished 25% faster than the infix user, even though the keystroke list was only about 5% shorter. In contrast, the RPN-er never paused, never hesitated, just wrote down keystrokes as fast as he could.Īfter that, we all decided that we should also time the remaining trials, which were all conducted with different candidates.

Make font smaller on ti nspire cx cas student software how to#

Everyone watching noticed that the infix-proponent often paused for a second or two to think about how to handle the next bit, or stopped for a moment to go back to count up parentheses. In all cases the RPN keystroke list was shorter, often considerably, but after the first was done everyone noticed a second interesting and unexpected outcome: The RPN-wielder finished writing down his keystroke list long before the infix-wielder - and not just because of the number of keystrokes.

Make font smaller on ti nspire cx cas student software series#

Each was to write down on the board, under the expression, the series of keystrokes that would be needed to evaluate it. Then for each expression, two candidates were selected, one from the RPN camp and one from the infix camp. One guy got on the whiteboard and wrote down four very complex arithmetic expressions. A measurable claim like that immediately sparked a demand for proof, so we decided to do some comparisons. Late one night the discussion got somewhat heated and someone said that an advantage of RPN was that it was faster because it required fewer keystrokes. I was an RPN-lover even then, having recently graduated from my 15C to a 28S, but most of the other geeks in the university computer lab where I spent a ridiculous amount of time couldn't see the sense in it.

I don't know that I can really articulate it, either, but I can report the results of an interesting experiment I participated in about 20 years ago. So I ask: Why do you, Slashdot users, like RPN?