LAST on HP20S

[Dave Frederickson]

(07-07-2016 09:05 PM)jbhp55 Wrote:  Thanks for the excellent explanation.
I still don't think it works well.

If I continue your example:
60
SIN -> 0.87
2
*
LAST (0.87)
= -> 1.73
+
3
*
LAST (here I'd expect 1.73, but 0.87 comes up!)
= -> 4.33 (instead of 5.20)

It is probably possible to formulate an algorithm to describe this behavior (indeed, that's in the calculator!), but it is not easy to understand for the poor user. So, it's back to STO en RCL for such calculations (or, better still, to RPN)

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.

Dave