HP35s: unexpected behaviour with LASTx
11-20-2015, 07:05 PM (This post was last modified: 11-20-2015 07:19 PM by Dieter.)
Post: #1
 Dieter Senior Member Posts: 2,397 Joined: Dec 2013
HP35s: unexpected behaviour with LASTx
Some time ago I found a somewhat strange behaviour of my 35s with LastX and Pi.
Maybe you can try this:

Code:
2 [ENTER] 5 [x]           10,0000 3 [LASTx] [x]             15,0000

So far, so good. After the first multiplication LASTx was set to the last factor 5, so the second calculation returned 3x5 = 15.

Now do the same with Pi instead of 3.

Code:
2 [ENTER] 5 [x]           10,0000 [π] [LASTx] [x]           31,4159

After pressing [LASTx] not the expected 5 appears, but the last result 10. It actually looks like pressing the [π] key causes the current X to become the new LASTx. So the result is not the expected but 10π.

You may even try this:

Code:
[CLSTK] [x]              0,0000   clears the complete stack including LastX 123 [π]                  3,1416   enters 123 and Pi [LASTx]                123,0000   obviously 123 has been moved to LastX

BTW this does not seem to happen with other constants, e.g. in the first example, [e] [LASTx] [x] returns e*5 = 13,5914.

Any ideas what's going on here?
May this be a firmware bug that sets LASTx when π is entered?
The 35s seems to behave as if π was a function π(x).

Dieter
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 Messages In This Thread HP35s: unexpected behaviour with LASTx - Dieter - 11-20-2015 07:05 PM RE: HP35s: unexpected behaviour with LASTx - renif - 11-20-2015, 07:58 PM RE: HP35s: unexpected behaviour with LASTx - Dieter - 11-20-2015, 08:15 PM RE: HP35s: unexpected behaviour with LASTx - Gerald H - 11-20-2015, 07:58 PM RE: HP35s: unexpected behaviour with LASTx - Paul Dale - 11-20-2015, 08:02 PM RE: HP35s: unexpected behaviour with LASTx - rprosperi - 11-20-2015, 09:55 PM RE: HP35s: unexpected behaviour with LASTx - Marcio - 11-20-2015, 08:41 PM RE: HP35s: unexpected behaviour with LASTx - Dieter - 11-20-2015, 09:10 PM RE: HP35s: unexpected behaviour with LASTx - Marcio - 11-20-2015, 10:35 PM RE: HP35s: unexpected behaviour with LASTx - toml_12953 - 12-09-2015, 08:45 PM RE: HP35s: unexpected behaviour with LASTx - rprosperi - 12-09-2015, 11:23 PM RE: HP35s: unexpected behaviour with LASTx - Gerald H - 12-10-2015, 06:23 AM RE: HP35s: unexpected behaviour with LASTx - Gerald H - 11-28-2015, 05:43 PM RE: HP35s: unexpected behaviour with LASTx - Marcio - 11-29-2015, 08:33 AM RE: HP35s: unexpected behaviour with LASTx - Bill Platt - 12-04-2015, 02:35 PM RE: HP35s: unexpected behaviour with LASTx - Gerald H - 12-04-2015, 03:45 PM RE: HP35s: unexpected behaviour with LASTx - Bill Platt - 12-10-2015, 05:05 PM RE: HP35s: unexpected behaviour with LASTx - Paul Dale - 12-09-2015, 09:14 PM

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