Search found 147 matches

by dlachieze
Sat Feb 16, 2019 10:44 am
Forum: Discuss!
Topic: Little Problem with Complex Mathematics on Calculators
Replies: 23
Views: 1163

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: 23
Views: 1163

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: 23
Views: 1163

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: 1117

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: 823

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: 15
Views: 1686

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: 15
Views: 1686

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...
by dlachieze
Thu Dec 06, 2018 5:06 pm
Forum: Developer Forum
Topic: DMCP_SDK Hello World
Replies: 42
Views: 4641

Re: DMCP_SDK Hello World

Anthills are not silent: Relaxing Sound of Ants Building Anthill, Birds Singing.
Here I don't hear any stick being moved around.
by dlachieze
Mon Nov 12, 2018 12:42 pm
Forum: Usage tips, tricks and problem reports
Topic: How to enter a right pointing triangle into a string in prgm mode?
Replies: 5
Views: 833

Re: How to enter a right pointing triangle into a string in prgm mode?

The DM42 encoder/decoder is a good place to create such strings.
For example enter in the listing windows:

Code: Select all

01▸LBL "TST"
02 "A▸B"
03 AVIEW
04 STOP
Encode and dowload the .raw to your DM42 (or Free42).
by dlachieze
Mon Oct 29, 2018 12:50 pm
Forum: Usage tips, tricks and problem reports
Topic: DM42- clock losing time
Replies: 8
Views: 1984

Re: DM42- clock losing time

I concur. Does anybody know the pins where a quartz could be added to make precise timing possible? As far as I can see on my DM42 there is already a 32.768KHz quartz (or oscillator) loaded (Q1). So I think that improving the accuracy may be done in software using some of the techniques described i...