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What calculator do you use ?
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olsenn:
I'm not a fan on stack based calculations (RPN) because I like to be able to see the whole equation on one line before I hit ENTER (or =). It is also easier to edit equation in single line entry, although it is quite a bit easier to enter equations using RPN than it is using standard algebreic entry.

However, modern TI calculators don't use this method... they use "Pretty Print" (or something like that, which basically means you can enter an equation exactly as you would on paper. There is no longer a need for excessive brackets. The devisor is placed underneath the dividend, exponents are displayed as superscripts, symbols are displayed instead of functions (square root sign instead of "sqrt(...)"), and you can you the up and down arrows to navigate between the different layers of the equation, instead of just left and right.

Entering complicated equations in my TI Nspire CX CAS is MUCH easier than entering them into my HP 50g. However, it is easier to enter equations in my HP 50g using the RPN mode than it is to enter those equations using its algebreic mode.
T4P:
i always use the TI-86 on my phone and ... i'll just say i find it very hard to use a normal scientific calculator anymore

The TI-Nspire CX CAS is really nice for what it does and the price is right.
ju1ce:
My TI-86 (bought in 2006) lost a few lines on the display. I "resoldered" the LCD cable (just heated it with a hot air gun and hoped for the best) and it works like a charm. While I'm not happy that the thing was hideously overpriced and broke down in five years, I still love TI because of their sample policy.

I've also got a TI 30-XA in the lab. I spilled some juice on it the very day I bought it.
Sal Ammoniac:
For me it's HP all the way! I've been using HP since my first calculator back in the early '70s.

In fact, the only time I've ever used a non-RPN calculator is when borrowing something from someone to do a quick calculation when I didn't have one of my HPs at hand.
PA4TIM:
HP-35S always in RPN mode and my most used and two casio Fx-something. Besides that two slide rules  8)
I would love to have an electonics sliderule (and the one HP made for VNA use in the early seventys)
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