The Museum of HP Calculators

HP Forum Archive 21

 HP 34s f'Message #1 Posted by Richard Berler on 3 Mar 2013, 12:18 p.m. How do I input the 'dx' into the HP 34s to calculate f'x when I wish a different increment than the default of .1?

 Re: HP 34s f'Message #2 Posted by Dieter on 3 Mar 2013, 2:09 p.m.,in response to message #1 by Richard Berler You know that the default dx is 0,1 so you probably have read the respective information regarding the f'(x) command: Quote: ATTENTION: f’(x) will look for a user routine labeled 'delta x', returning a fixed step size dx in X. If that routine is not defined, dx = 0.1 is set for default (arbitrary, but it had to be specified). So you simply have to provide a routine labelled with a lower case (!) greek delta and a lower case x. To do so, press the following keys: ```[f] [LBL] [ENTER] display shows LBL ' [f] [^] (EXIT key with the yellow arrow) switches to lower case [g] [D] enters a (now lower case) greek delta X (on the "." key) enters a (still lower case) x [ENTER] completes the command (and cancels lower case mode). ``` So, to set dx = 0.001, simply enter ```001 LBL'delta x' / "delta" = lower case delta character 002 1 003 SDR 3 004 RTN ``` Dieter

 Re: HP 34s f'Message #3 Posted by Paul Dale on 3 Mar 2013, 4:25 p.m.,in response to message #2 by Dieter Quote:So you simply have to provide a routine labelled with a lower case (!) greek delta and a lower case x. Not quite. The calculator looks for all possible different case versions of delta and x in this order: [delta]x [delta]X [DELTA]x [DELTA]X - Pauli

 Re: HP 34s f'Message #4 Posted by Dieter on 3 Mar 2013, 5:38 p.m.,in response to message #3 by Paul Dale Fine - but in this case this should also be documented in the manual. The current version says two lowercase characters are mandatory. Finally, also the search order should be reversed since an uppercase [DELTA] X is the easiest way to enter a valid label, so it should be found as fast as possible. :-) Dieter

 Re: HP 34s f'Message #5 Posted by Marcus von Cube, Germany on 3 Mar 2013, 2:44 p.m.,in response to message #1 by Richard Berler Richard, Dieter has already answered your question. I'd just like to add that the name of the device does not start with an 'H' but with a 'W'. ;-)

 Re: HP 34s f'Message #6 Posted by aurelio on 3 Mar 2013, 5:11 p.m.,in response to message #5 by Marcus von Cube, Germany Quote: Richard, Dieter has already answered your question. I'd just like to add that the name of the device does not start with an 'H' but with a 'W'. ;-) "give Caesar, what Caesar's (to Caesar belong)"...I don't know how to translate it in english, but correct remark, Marcus

 Re: HP 34s f'Message #7 Posted by Ethan Conner on 3 Mar 2013, 5:25 p.m.,in response to message #6 by aurelio Matthew 22:21 Give unto Caeser what is Caeser's, and to God what is God's.

 Re: HP 34s f'Message #8 Posted by Massimo Gnerucci (Italy) on 3 Mar 2013, 5:29 p.m.,in response to message #6 by aurelio I think it could be "Give credit where credit is due" or "Give the devil his due". Idiomatic expressions are sneaky...:-)

 Re: HP 34s f'Message #9 Posted by Gerson W. Barbosa on 3 Mar 2013, 5:34 p.m.,in response to message #6 by aurelio Quote: I don't know how to translate it in english As late as when I was 17 my mother made me attend Sunday School every Sunday, so I still remember this: It's a good thing 'W' is also an upside down 'M' so the whole Trinity is there :-) Edited: 3 Mar 2013, 5:36 p.m.

 Re: HP 34s f'Message #10 Posted by Walter B on 3 Mar 2013, 10:27 p.m.,in response to message #9 by Gerson W. Barbosa Quote: It's a good thing 'W' is also an upside down 'M' so the whole Trinity is there :-) If you want to stress that 'Trinity' picture even further: first was the father and the spirit, then came the son - it even follows history. d;-)

 Re: HP 34s f'Message #11 Posted by Paul Dale on 3 Mar 2013, 10:30 p.m.,in response to message #9 by Gerson W. Barbosa There has been a lot of work put in by others as well. - Pauli

 Re: HP 34s f'Message #12 Posted by Walter B on 3 Mar 2013, 10:39 p.m.,in response to message #11 by Paul Dale ... please read the acknowledments in 'Welcome'. d:-)

 Re: HP 34s f'Message #13 Posted by Marcus von Cube, Germany on 4 Mar 2013, 1:23 p.m.,in response to message #12 by Walter B Or just execute the WHO command. :-) The most prominent contributions are by: Neil who wrote the assembler which is an integral part of the build system, Pascal who is the 'portability guy' in the team, responsible for the cross platform emulators (stay tuned!) but also for the stop watch, Harald who has added USB to the system, Katie who laid the foundation of the printing hardware. A lot of input came from other regulars of this friendly and collaborative place. We have to thank all of them!

 Re: HP 34s f'Message #14 Posted by Neil Hamilton (Ottawa) on 4 Mar 2013, 2:36 p.m.,in response to message #13 by Marcus von Cube, Germany Eric who has laboured manufacturing the keyboard overlay.

 Re: HP 34s f'Message #15 Posted by Marcus von Cube, Germany on 5 Mar 2013, 3:48 p.m.,in response to message #14 by Neil Hamilton (Ottawa) Sorry, my omission...

 Re: HP 34s f'Message #16 Posted by Gerson W. Barbosa on 6 Mar 2013, 10:19 p.m.,in response to message #14 by Neil Hamilton (Ottawa) Quote: Eric who has laboured manufacturing the keyboard overlay. Which gives the WP 34S a pro look, thus befitting your efforts and others. BTW, mine has just been applied a brand-new overlay. Eric, thank you very much!

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