Brand new to RPN, few questions on bits!

[Les Bell]

(09-09-2014 02:32 PM)Kyburo Wrote:  Also cheers Les! I can completely follow your programs logic thanks to the comments, and I'd not actually realised you could use ENTER^ in that way. Until now I've been using the STO feature at the start each time

OBTW, writing a short program that way is the standard way of defining a function for use with the solvers and root finders of the older RPN calculators. For example, with the HP-41CX and its Advantage Pac, one would store that program (albeit with a longer, global, label like "EX" rather than just "E"), then store the name of the function ("EX") in the calculator's alpha register, the initial search range into the y and x registers, then "XEQ SOLVE". With your example, and a starting range of (-5,5) it produces the answer of -3.0 in a few seconds. So that's the answer to your second question - again, from a old-style "classic RPN" point of view.