LAST on HP20S

[rprosperi]

(07-07-2016 10:55 PM)Dave Frederickson Wrote:  The manual states that a copy of the last result is stored in the LAST register when you start a new calculation. After pressing SIN you enter 2 * ... which is a new calculation and 0.87 was stored in the LAST register. After pressing = you continue with + 3 *, which is a continuation of the last equation, not a new calculation, consequently LAST is not updated.

Thanks Dave, you beat me to it.

In fairness to jaap, I did not include that important qualifier in the explanation, so apologize for oversight in the explanation.

But, if RPN is a choice, definitely go that way (32S or 32SII are fairly similar in scope and nearly the same h/w as a 20S). With RPN, no need to understand these odd little rules, it's always up to you to manage the stack, and the stack is always just the way you left it.