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 ▼ Richard Berler Unregistered Posts: 109 Threads: 38 Joined: Dec 2012 03-03-2013, 12:18 PM 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? ▼ Dieter Unregistered Posts: 653 Threads: 26 Joined: Aug 2010 03-03-2013, 02:09 PM 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 ▼ Paul Dale Unregistered Posts: 3,229 Threads: 42 Joined: Jul 2006 03-03-2013, 04:25 PM 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 ▼ Dieter Unregistered Posts: 653 Threads: 26 Joined: Aug 2010 03-03-2013, 05:38 PM 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 Marcus von Cube, Germany Unregistered Posts: 3,283 Threads: 104 Joined: Jul 2005 03-03-2013, 02:44 PM 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'. ;-) ▼ aurelio Unregistered Posts: 312 Threads: 25 Joined: Sep 2009 03-03-2013, 05:11 PM 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 ▼ Ethan Conner Unregistered Posts: 236 Threads: 18 Joined: Aug 2011 03-03-2013, 05:25 PM Matthew 22:21 Give unto Caeser what is Caeser's, and to God what is God's. Massimo Gnerucci (Italy) Unregistered Posts: 882 Threads: 23 Joined: Jan 2005 03-03-2013, 05:29 PM I think it could be "Give credit where credit is due" or "Give the devil his due". Idiomatic expressions are sneaky...:-) Gerson W. Barbosa Unregistered Posts: 2,761 Threads: 100 Joined: Jul 2005 03-03-2013, 05:34 PM 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. ▼ Walter B Unregistered Posts: 4,587 Threads: 105 Joined: Jul 2005 03-03-2013, 10:27 PM 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;-) Paul Dale Unregistered Posts: 3,229 Threads: 42 Joined: Jul 2006 03-03-2013, 10:30 PM There has been a lot of work put in by others as well. - Pauli ▼ Walter B Unregistered Posts: 4,587 Threads: 105 Joined: Jul 2005 03-03-2013, 10:39 PM ... please read the acknowledments in 'Welcome'. d:-) ▼ Marcus von Cube, Germany Unregistered Posts: 3,283 Threads: 104 Joined: Jul 2005 03-04-2013, 01:23 PM 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! ▼ Neil Hamilton (Ottawa) Unregistered Posts: 255 Threads: 22 Joined: May 2011 03-04-2013, 02:36 PM Eric who has laboured manufacturing the keyboard overlay. ▼ Marcus von Cube, Germany Unregistered Posts: 3,283 Threads: 104 Joined: Jul 2005 03-05-2013, 03:48 PM Sorry, my omission... Gerson W. Barbosa Unregistered Posts: 2,761 Threads: 100 Joined: Jul 2005 03-06-2013, 10:19 PM 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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