WP34S for the DM42

This is where developers can exchange ideas and ask questions relevant to the DM42 firmware.

Please note that Swiss Micros staff are unable to provide answers here as a general rule. This is intended as a community-driven forum.
Nigel (UK)
Posts: 55
Joined: Fri Jul 21, 2017 11:08 pm

Re: WP34S for the DM42

Post by Nigel (UK) »

lrdheat wrote:
Thu May 27, 2021 4:10 am
Hi Nigel,

I’m having difficulty typing/finding the symbol delta x or delta Greek d, even outside of a program. How do I find these characters? Do I call the program (symbol)delta (Greek) d? How do I type the delta (symbol) d (Greek character) into the label command?
Here's an example of a program that you can use:

LBL'\(\Delta X\)'
RCL 99
END

You enter the first line like this:
  • LBL
  • ENTER - enters alpha mode;
  • SHIFT SHIFT D - enters capital Delta;
  • X
  • ENTER - leaves alpha mode and completes the label
This program lets you change the value of \(\epsilon\) by storing different numbers in register 99 (you can clearly choose a different register if you prefer!). It also means that you can move the \(\Delta X\) program into the flash region, as you won't need to edit it when you change \(\epsilon\).

I've tried using SLV along with the LBL'\(\Delta X\)' program above to find the zeros of the derivative of the function in your original post. With 0.1 stored in register 99 I get the result that you give; with 0.01 stored in register 99 I get 0.25 as the location of the extremum. So that seems to work!

Nigel (UK)
User avatar
Walter
Posts: 1914
Joined: Tue May 02, 2017 11:13 am
Location: Close to FRA, Germany

Re: WP34S for the DM42

Post by Walter »

Poor little WP34S, did they steal you two colours? :(
DM42 SN: 00041 β
WP 43S running on this device

HP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L
Nigel (UK)
Posts: 55
Joined: Fri Jul 21, 2017 11:08 pm

Re: WP34S for the DM42

Post by Nigel (UK) »

Walter wrote:
Thu May 27, 2021 4:33 pm
Poor little WP34S, did they steal you two colours? :(
Yes, but they gave me menus, so I'm happy! 8-)

WP34S

pp Nigel (UK)
User avatar
Walter
Posts: 1914
Joined: Tue May 02, 2017 11:13 am
Location: Close to FRA, Germany

Re: WP34S for the DM42

Post by Walter »

Nigel (UK) wrote:
Thu May 27, 2021 9:35 pm
Walter wrote:
Thu May 27, 2021 4:33 pm
Poor little WP34S, did they steal you two colours? :(
Yes, but they gave me menus, so I'm happy! 8-)
So you seduced our little WP34S using cheap menus... :(

Please allow me quoting Bert Brecht: 'Erst kommt das Fressen, dann kommt die Moral.' (~ 'First food, then morals.')
DM42 SN: 00041 β
WP 43S running on this device

HP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L
lrdheat
Posts: 11
Joined: Tue May 02, 2017 6:17 pm

Re: WP34S for the DM42

Post by lrdheat »

Thanks Nigel and Walter! It works great now!
lrdheat
Posts: 11
Joined: Tue May 02, 2017 6:17 pm

Re: WP34S for the DM42

Post by lrdheat »

Somewhere, I think I read that the epsilon should be about 3root of number of digits utilized by calculator...I chose 1E-6. The extremum was found accurate to all 16 digits!
User avatar
ijabbott
Posts: 209
Joined: Fri Dec 15, 2017 2:34 pm
Location: GB-MAN

Re: WP34S for the DM42

Post by ijabbott »

Walter wrote:
Thu May 27, 2021 10:44 pm
Nigel (UK) wrote:
Thu May 27, 2021 9:35 pm
Walter wrote:
Thu May 27, 2021 4:33 pm
Poor little WP34S, did they steal you two colours? :(
Yes, but they gave me menus, so I'm happy! 8-)
So you seduced our little WP34S using cheap menus... :(

Please allow me quoting Bert Brecht: 'Erst kommt das Fressen, dann kommt die Moral.' (~ 'First food, then morals.')
Yes, but the menus are wipe cleanable. None of your cheap rubbish! :D
User avatar
Walter
Posts: 1914
Joined: Tue May 02, 2017 11:13 am
Location: Close to FRA, Germany

Re: WP34S for the DM42

Post by Walter »

ijabbott wrote:
Sun May 30, 2021 10:37 pm
Walter wrote:
Thu May 27, 2021 10:44 pm
Nigel (UK) wrote:
Thu May 27, 2021 9:35 pm

Yes, but they gave me menus, so I'm happy! 8-)
So you seduced our little WP34S using cheap menus... :(

Please allow me quoting Bert Brecht: 'Erst kommt das Fressen, dann kommt die Moral.' (~ 'First food, then morals.')
Yes, but the menus are wipe cleanable. None of your cheap rubbish! :D
Please elaborate a bit. :?
DM42 SN: 00041 β
WP 43S running on this device

HP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L
User avatar
ijabbott
Posts: 209
Joined: Fri Dec 15, 2017 2:34 pm
Location: GB-MAN

Re: WP34S for the DM42

Post by ijabbott »

Walter wrote:
Sun May 30, 2021 11:37 pm
ijabbott wrote:
Sun May 30, 2021 10:37 pm
Walter wrote:
Thu May 27, 2021 10:44 pm

So you seduced our little WP34S using cheap menus... :(

Please allow me quoting Bert Brecht: 'Erst kommt das Fressen, dann kommt die Moral.' (~ 'First food, then morals.')
Yes, but the menus are wipe cleanable. None of your cheap rubbish! :D
Please elaborate a bit. :?
Just a little joke, as wipe-clean menus are associated more with the less classy restaurants.
dlachieze
Posts: 317
Joined: Thu May 04, 2017 12:20 pm
Location: France

Re: WP34S for the DM42

Post by dlachieze »

As there has not been any new comment on the QRG, I've updated the QRG to rev 1.0 above:
  • Updated Integrate menu with f'(x) and f''(x)
  • Minor wording changes for f DISP and f CUSTOM
  • Minor cosmetic changes overall in text alignment & paragraph spacing
This is now the final version of the QRG. I'm not planning any new change unless someone comes with a change request.
DM42: 00425 - DM41X: β00066
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