Search found 317 matches

by rprosperi
Thu Feb 21, 2019 6:53 pm
Forum: Hardware
Topic: DM15L keyboard faceplate is separating
Replies: 28
Views: 2900

Re: DM15L keyboard faceplate is separating

So, Voyager series has a serious issue with gluing/faceplate. Not all SM Voyagers. I've had a DM15L for a few years, used semi-frequently (a few times each week, maybe 2 weeks) and have never had any kind of faceplate separation; perhaps the issue depends on environmental conditions, or possibly yo...
by rprosperi
Tue Feb 19, 2019 11:34 pm
Forum: Discuss!
Topic: Little Problem with Complex Mathematics on Calculators
Replies: 23
Views: 1383

Re: Little Problem with Complex Mathematics on Calculators

Thanks for walking some of us through this stuff Thomas. Take an integer, and consider it as two numbers, with their digits interleaved. Say, 123456: this can be considered as 135 combined with 246. Any pair of integers can be represented as a single integer in this manner. In fact, with this kind o...
by rprosperi
Tue Feb 19, 2019 7:49 pm
Forum: Discuss!
Topic: Little Problem with Complex Mathematics on Calculators
Replies: 23
Views: 1383

Re: Little Problem with Complex Mathematics on Calculators

It seems intuitive that there should be more rational numbers than integers, but this is where intuition is wrong. The set of integers and the set of rational numbers have the same size in the same way that the set of even integers has the same size as the set of integers. However, the set of real ...
by rprosperi
Sun Feb 17, 2019 7:05 pm
Forum: DM1x/DM41
Topic: [DM10L] Coming soon!
Replies: 31
Views: 2273

Re: [DM10L] Coming soon!

+1 8-) Although it's looking nicely, its computing power per sfr is simply far lower than the one of the DM11L or DM15L. "sfr" ? True, but the new h/w will make this still much faster than any of the original Voyagers, even if hobbled a bit by the limited programming commands and editor. Easily the...
by rprosperi
Fri Feb 15, 2019 1:49 am
Forum: Discuss!
Topic: Little Problem with Complex Mathematics on Calculators
Replies: 23
Views: 1383

Re: Little Problem with Complex Mathematics on Calculators

I came across the following quite simple calculation: 0 [1/x] [+/-] returns -∞ . We all know that SQRT( -∞ ) = i ∞ . The calculator returns 0. + i ∞ which is perfectly equivalent. Now let's revert this last operation by squaring: (i ∞ )^2 = -∞ . So far so good. But (0 + i ∞ )^2 = 0 + ( -∞ ) + 2 i 0...
by rprosperi
Wed Feb 13, 2019 12:44 am
Forum: DM42
Topic: Looking forward to the DM42 update utilizing the Free42 2.023 update...
Replies: 29
Views: 2104

Re: Looking forward to the DM42 update utilizing the Free42 2.023 update...

Zeno, The point being discussed here is not IF the 2.023 changes should be included in the DM42, of course they should! The point being discussed is WHEN to include the changes and make a new release. Each new version of DM42 takes a lot of effort: make the code changes, testing the new changes, reg...
by rprosperi
Tue Feb 12, 2019 2:52 pm
Forum: DM42
Topic: Looking forward to the DM42 update utilizing the Free42 2.023 update...
Replies: 29
Views: 2104

Re: Looking forward to the DM42 update utilizing the Free42 2.023 update...

Thanks for explaining the status of Free42 and your methodology for releasing updates Thomas. To clarify my post above, I was not suggesting the Free42 update was not necessary, only the DM42 update based solely on the changes in your 2.023. The multi-platform nature of Free42 dictates that there is...
by rprosperi
Tue Feb 12, 2019 2:14 am
Forum: DM42
Topic: Looking forward to the DM42 update utilizing the Free42 2.023 update...
Replies: 29
Views: 2104

Re: Looking forward to the DM42 update utilizing the Free42 2.023 update...

An up to dat DM42 is a better DM42 :) I disagree. The changes in 2.023 are small, highly specialized and very unlikely to matter to almost anyone, and simply do not warrant a new release of DM42 on their own. It makes more sense to spend the limited time David has to continue work on other forthcom...
by rprosperi
Sun Feb 10, 2019 10:06 pm
Forum: DM42
Topic: Benchmark test e^x^3
Replies: 5
Views: 541

Re: Benchmark test e^x^3

On the DM42 on battery power (so, the slow mode):

For interval of 0..6 => about 2-3 seconds
For interval of 0..13 => about 11-12 seconds.
For interval of 0..22 => about 22-23 seconds (value=1.61E4621)

So, pretty quick!

Edit after more posts): Eps used was 1E-06
by rprosperi
Wed Feb 06, 2019 9:31 pm
Forum: Hardware issues
Topic: Keyboard debouncing
Replies: 63
Views: 8549

Re: Keyboard debouncing

IIRC, far less people complained about ENTER at times when one-line displays were standard. More than two output lines seem to add confusion instead of enlightenment. Just an observation. ;) I've noticed this too Walter, quite weird and unexpected; it would seem that being able to view more of the ...