Plot more than two functions
11-13-2017, 05:28 PM
Post: #1
 MullenJohn Junior Member Posts: 43 Joined: Sep 2017
Plot more than two functions
With the HP Prime in CAS Mode I am trying to plot on one screen the Function, the First Derivative and the Second Derivative to interpret Concavity and Points of Inflection of the function.
For example:
√ F1(X): 2*(X²-9)/(X²-4)
√ F2(X): ∂F1(X)/∂X
√ F3(X): ∂F2(X)/∂X
Upon pressing the Plot key my plot only shows F1(X) and does not show F2(X) and/or F3(X).
Please tell me what I am doing incorrectly so that I may plot all three functions simultaneously.
Thanks – Cheers!
11-13-2017, 08:14 PM
Post: #2
 ThomasA Junior Member Posts: 27 Joined: May 2014
RE: Plot more than two functions
Hi,
to plot the derivatives you have just to add '=X' behind the 'X's in the denominator of the expressions. It should look like 'dX=X' in the denominator (without the apostrophes, of course) and with the
'funny d' and not the 'd'.
Thomas
11-13-2017, 08:25 PM
Post: #3
 MullenJohn Junior Member Posts: 43 Joined: Sep 2017
RE: Plot more than two functions
Thank you Thomas - it worked just fine - Cheers!
11-13-2017, 08:29 PM
Post: #4
 Tim Wessman Senior Member Posts: 2,292 Joined: Dec 2013
RE: Plot more than two functions
(11-13-2017 08:14 PM)ThomasA Wrote:  Hi,
to plot the derivatives you have just to add '=X' behind the 'X's in the denominator of the expressions. It should look like 'dX=X' in the denominator (without the apostrophes, of course) and with the
'funny d' and not the 'd'.
Thomas

Note that you don't need to do this any more on the current Beta version...

TW

Although I work for HP, the views and opinions I post here are my own.
11-13-2017, 08:31 PM
Post: #5
 MullenJohn Junior Member Posts: 43 Joined: Sep 2017
RE: Plot more than two functions
Thomas, I just noticed that the Num Key shows no values for F1, F2 or F3.

Would you know the reason why the cells are empty in the Numeric view?

Cheers!
11-14-2017, 10:06 AM
Post: #6
 ThomasA Junior Member Posts: 27 Joined: May 2014
RE: Plot more than two functions
I am sorry, but I can't reproduce your observation. On my machine all columns are filled with numbers or with NaN's. I use the november beta release.
Thomas
11-14-2017, 04:11 PM
Post: #7
 MullenJohn Junior Member Posts: 43 Joined: Sep 2017
RE: Plot more than two functions
With the HP Prime in CAS Mode I am trying to plot on one screen the Function, the First Derivative and the Second Derivative to interpret Concavity and Points of Inflection of the function.
For example:
√ F1(X): 2*(X²-9)/(X²-4)
√ F2(X): ∂F1(X)/∂X=X
√ F3(X): ∂F2(X)/∂X=X
Upon pressing the Plot key my plot shows F1(X), F2(X) and F3(X) simultaneously on the Plot screen correctly.
However, upon pressing the Num key the X, F1, F2, F3 cells are blank.
E.g.
___________________
| X | F1 | F2 | F3 |
--------------------------
| | | | |
--------------------------

Please tell me what I am doing incorrectly so that I may see all three functions numerically.

Also, should I install the November Beta Release?
If so where do I find the procedure for step-by-step instructions?
Thanks Thomas – Cheers!
11-14-2017, 07:16 PM
Post: #8
 roadrunner Senior Member Posts: 438 Joined: Jun 2015
RE: Plot more than two functions
go to shift/setup, make sure num type is set to automatic
11-14-2017, 07:34 PM
Post: #9
 MullenJohn Junior Member Posts: 43 Joined: Sep 2017
RE: Plot more than two functions
Thank you RoadRunner! I had it set to "BuildYourOwn" - No idea why. Now it works - Cheers!
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