Search found 105 matches

by H2X
Mon Feb 18, 2019 7:36 pm
Forum: Discuss!
Topic: Little Problem with Complex Mathematics on Calculators
Replies: 9
Views: 320

Re: Little Problem with Complex Mathematics on Calculators

... while we're waiting, here's an interesting take on imaginary numbers:

Image
by H2X
Mon Feb 18, 2019 1:29 pm
Forum: Discuss!
Topic: Little Problem with Complex Mathematics on Calculators
Replies: 9
Views: 320

Re: Little Problem with Complex Mathematics on Calculators

Anyway I'm not an expert in these matters so I would like to ear from more competent people. I am not an expert either, but clearly there are kinds of infinities which cannot be easily compared. While there is an infinite number of integer values, it seems logical that the also infinite number of r...
by H2X
Mon Feb 18, 2019 1:21 pm
Forum: DM1x/DM41
Topic: [DM10L] Coming soon!
Replies: 21
Views: 432

Re: [DM10L] Coming soon!

I am interested, if the price is not too scary...
by H2X
Fri Feb 15, 2019 8:58 am
Forum: Discuss!
Topic: Little Problem with Complex Mathematics on Calculators
Replies: 9
Views: 320

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 H2X
Fri Feb 15, 2019 6:28 am
Forum: Discuss!
Topic: Little Problem with Complex Mathematics on Calculators
Replies: 9
Views: 320

Re: Little Problem with Complex Mathematics on Calculators

Walter wrote:
Thu Feb 14, 2019 8:57 pm
But (0 + i )^2 = 0 + (-∞) + 2 i 0 = -∞ + 2 i 0 .
Aren't you assuming that 0 times ∞ is defined yourself? If 0 times ∞ is undefined, 2 i 0 ∞ is not defined either?
by H2X
Wed Feb 13, 2019 1:03 pm
Forum: DM42
Topic: Finally deciding to purchase DM 42. I have a question first however.
Replies: 13
Views: 993

Re: Finally deciding to purchase DM 42. I have a question first however.

Walter wrote:
Sun Feb 10, 2019 10:51 pm
grsbanks wrote:
Sun Feb 10, 2019 9:14 pm
You're probably better off ordering direct from SwissMicros anyway: https://www.swissmicros.com/order.php
... and you won't be feeding Amazon.
If only there was a way to feed the people working at Amazon...
by H2X
Mon Feb 11, 2019 10:27 am
Forum: Discuss!
Topic: We need you for the 43S. Yes, you!
Replies: 16
Views: 1111

Re: We need you for the 43S. Yes, you!

I'm the programmer who has been working on the WP43S simulator for a year now. The task is huge and I won't be able to do it alone in a reasonable time. Are there any HP geeks out there who are C programmers interested in participating in the development of the WP43S simulator? The two tasks that a...
by H2X
Sun Jan 27, 2019 3:06 pm
Forum: Hardware issues
Topic: buttons that don't register well
Replies: 183
Views: 26430

Re: buttons that don't register well

Keyboard issues on the DM1xL seem to be indeed less frequently reported but do occur still (plus I believe that only a few people report issues so what we see on the net is probably just the 'tip of the iceberg'). As recently as 11 Jan 2018 one Amazon (verified) reviewer of the DM15L said : "...The...
by H2X
Thu Jan 24, 2019 8:17 am
Forum: Update Announcements
Topic: UPDATE: DMCP-3.12 / DM42-3.12
Replies: 21
Views: 1586

Re: UPDATE: DMCP-3.12 / DM42-3.12

Power-off mode Offers several levels of power off with different components switched on/off. Useful for diagnosing excessive power consumption. Which components need to be switched on when the calculator is switched off? I am actually having a bit of bother which seems related to power. Several mon...
by H2X
Wed Jan 23, 2019 11:20 pm
Forum: Update Announcements
Topic: UPDATE: DMCP-3.12 / DM42-3.12
Replies: 21
Views: 1586

Re: UPDATE: DMCP-3.12 / DM42-3.12

grsbanks wrote:
Tue Jan 22, 2019 1:04 pm
Power-off mode

Offers several levels of power off with different components switched on/off. Useful for diagnosing excessive power consumption.
Which components need to be switched on when the calculator is switched off?