Search found 160 matches

by dlachieze
Fri Mar 15, 2019 12:31 pm
Forum: Update Announcements
Topic: UPDATE: DMCP-3.13 / DM42-3.13
Replies: 40
Views: 6140

Re: UPDATE: DMCP-3.13 / DM42-3.13

Perfect update with the combo file from 3.12. The new file management with directories, increased file items and two column display is really cool :) Just noticed one thing: if you move to the <Parent> directory from the PROGRAMS or STATE directories, then both of them are not listed and you cannot ...
by dlachieze
Thu Mar 14, 2019 11:20 pm
Forum: Software Library
Topic: External stack
Replies: 43
Views: 5018

Re: External stack

You can also see the PUSH/POP stack routines published earlier in this sub-forum.
by dlachieze
Wed Feb 20, 2019 6:11 am
Forum: Discuss!
Topic: Little Problem with Complex Mathematics on Calculators
Replies: 25
Views: 2949

Re: Little Problem with Complex Mathematics on Calculators

pauli wrote:
Wed Feb 20, 2019 1:02 am
Infinity is not a number and shouldn't be considered one.
This could the key for the initial issue reported by Walter. While the distributivity law is perfectly valid in ℂ, this may not be valid anymore if you try to apply it to infinity.
by dlachieze
Sat Feb 16, 2019 10:44 am
Forum: Discuss!
Topic: Little Problem with Complex Mathematics on Calculators
Replies: 25
Views: 2949

Re: Little Problem with Complex Mathematics on Calculators

Well, I think that the real question is how you add infinity to ℂ. As far as I know this is called the compactification of ℂ. With the Riemann sphere and the associated extended complex plane there is only one complex infinity, so if I understand it correctly there is nothing like i ∞, juste one com...
by dlachieze
Fri Feb 15, 2019 9:49 am
Forum: Discuss!
Topic: Little Problem with Complex Mathematics on Calculators
Replies: 25
Views: 2949

Re: Little Problem with Complex Mathematics on Calculators

Doing some research I’ve found that for both Wolfram Alpha and the HP Prime: SQRT(-1/0) returns the complex infinity (which is not i ∞ ). As you’re taking the square root of a negative value you're moving to the complex plane where there is only one infinity, the complex infinity which is linked to ...
by dlachieze
Fri Feb 15, 2019 8:40 am
Forum: Discuss!
Topic: Little Problem with Complex Mathematics on Calculators
Replies: 25
Views: 2949

Re: Little Problem with Complex Mathematics on Calculators

We all know that SQRT( -∞ ) = i ∞ . The calculator returns 0. + i ∞ which is perfectly equivalent. Probably not competent either, but I know that infinity is tricky... For example you can also say that -i + i ∞ is perfectly equivalent to i ∞ . But (-i + i ∞ )*(-i + i ∞ ) = -1 - ∞ +2 ∞ which is unde...
by dlachieze
Fri Dec 28, 2018 3:50 pm
Forum: DM42
Topic: Dave Jones (EEVBLOG) tries the DM42
Replies: 11
Views: 1911

Re: Dave Jones (EEVBLOG) tries the DM42

What value did you had in the X-register when you launched RFC?

I have not tested RFC on my DM42, but I did test it on Free42 and it is working with for ex. 15 or 19 as the start value.
by dlachieze
Thu Dec 20, 2018 12:40 pm
Forum: Discuss!
Topic: What do all those bots here?
Replies: 8
Views: 1423

Re: What do all those bots here?

Indexing for search engines I suppose...

I don't think they are really looking for DM42 tips, well maybe Alexa, to be able to answer to anybody yelling in his kitchen: "how much pounds of flour do I need for my pancakes?"
with "let me pull my DM42 and do the calculation for you"
by dlachieze
Thu Dec 13, 2018 8:55 am
Forum: DM42
Topic: Feature requests
Replies: 33
Views: 5107

Re: Feature requests

... REM "comment" RCL+ 17 ... In a keystroke programming model you would have: step xxx REM step xxx+1 "comment" step xxx+2 RCL+ 17 The new REM instruction would just skip the next step to avoid putting the comment string in the Alpha register. You can already do this with: step xxx FS? 52 step xxx...
by dlachieze
Thu Dec 13, 2018 7:48 am
Forum: DM42
Topic: Feature requests
Replies: 33
Views: 5107

Re: Feature requests

Walter wrote:
Wed Dec 12, 2018 9:42 pm
I'd vote for inline comments - something like
...
RCL+17 /* comment
...
allowing for commenting each step.
How would you implement this in a keystroke programming model such as the 42S one? /* would obviously be translated to divide and multiply instructions...