General > General Technical Chat
Do you still use stand-alone ("pocket") calculators?
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johnboxall:

--- Quote from: RoGeorge on May 22, 2023, 08:25:52 am ---
--- Quote from: johnboxall on May 21, 2023, 12:25:24 pm ---Yes. I spend a few hours a day in an environment where we can't have any radio signals, static, etc. So I take in a HP 35s.

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Is HP35s in a metal enclosure, or do you just turn it off during measurements?

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It has a plastic enclosure. I usually turn it off after use, more of a reflex/OCD thing than anything.
pdenisowski:
All the time :)


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David Hess:

--- Quote from: DrGeoff on May 21, 2023, 11:33:25 pm ---
--- Quote from: rsjsouza on January 31, 2020, 05:14:21 pm ---
--- Quote from: george.b on January 21, 2020, 06:53:41 am ---
--- Quote from: Mortymore on January 19, 2020, 12:03:23 am ---Integral of ln(x^2)dx, from -5 to 99 (EDIT: as can be seen in the photo, on Casio FX-991ES display)

Casio FX-991ES -------- 3m15s -------------- 717.9281095
HP 39G II ---------------- 7s ------------------- 717.928109451
HP 49G+ ----------------- 25m 38s ----------- 717.928325369
HP 40GS ----------------- 20m48s ------------ 717.928325369
HP 49G ------------------ 54m54s ------------- 717.928325369
HP 48G -------------- was not able to solve
Microsoft Mathematics on a i5 ---- 0s ------ 717.9281094509898

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My HP 48G+ finished it, took a long time (sorry, didn't measure it), but it arrived to a result of 717.928325369.
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My HP35S failed to compute due to the discontinuity, but the 48G emulated on my Galaxy S8 (Droid48) finished in about 45s with the same result of 717.928325369.  :-+
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Just to add to the numbers. On an old (1980/81) HP15C this took 10m35s and evaluated as 718.0021.
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After resetting various CAS parameters, HP50g took just seconds to reach the HP 39G II result of 717.928109451.
Ed.Kloonk:
As I mentioned previously in the purchased-today thread, I recently bought a exact pocket calculator like my own one from the mid 80's. It has some nice Hex/Bin/Dec features and I'm quite fond if it. And it's sure seen some battles.

The battery in my old one is starting to go and rather than fix that, I just bought another one from some guy in Europe.

So this thing arrived and compared to my old one, the 'new' one is in mint condition. I mean really remarkable good condition. It's still in the cardboard box it came and I'm too frightened to contaminate it.
kripton2035:
HP prime (G1, a G2 would be faster)
Integral of ln(x^2)dx, from -5 to 99
took no time to calculate, 0s and gave 717.928109451
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