HP Spice series simulators for iPhone

[Matt Agajanian]

(02-20-2016 11:36 PM)Willy R. Kunz Wrote:  

(02-20-2016 09:04 PM)Matt Agajanian Wrote:  Hi there.

Excellent news! I have wanted to get the 32E on my iPad! Works nicely in portrait mode. There seems to be a glitch though. Or, I may be missing a step. On both my iPhone 4S and iPad Mini 2 running iOS 9.2.1, keying in the famous Mach calculation exactly from HP manuals seems to yield incorrect intermediate results. Even after I have both removed, reinstalled the app and reset my iPhone & iPad.

GOOD NEWS IS the 35 intermediate and final result calculations are correct though.

Please advise.

Thanks

Hi Matt,

I entered the Mach formula in RPN-32 on my iPhone 6 exactly as shown here: Mach
(scroll down half the page to Example XXVI)

I found two differing results:
4th to last: 0.579614684 vs. 0.579614685 on RPN-32 (vs. .5796146848 on RPN-35)
Final result: 0.835724536 vs. 0.835724535 on RPN-32 (vs. .8357245352 on RPN-35)

The corresponding 15-digit results are:
0.579614684798178
0.835724535175251

So it seems RPN-32 simply gives more precise results than the original calculators. As does RPN-35.
Sorry about that.

Okay. Here's what I notice:

After going through the HP-45 and onward steps for the Mach calculation, I tried the HP-35 variation--ENTER^ x for x^2. So, after I press 350 ENTER^ 661.5 / ENTER^ x

somehow when I enter 0.2 x, the result is 0. It seems after the HP-35 method of ENTER^ x, the stack lift is disabled and 0.2799 is cleared from the Y register. Just a hunch but, it seems +, -, x, and / disable stack lift. But, like I said, when I tried the HP-35 method of ENTER^ x to square, somehow stack lift doesn't go.