# HP Forums

Full Version: Plot more than two functions
You're currently viewing a stripped down version of our content. View the full version with proper formatting.
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!
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
Thank you Thomas - it worked just fine - Cheers!
(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...
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!
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
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!
go to shift/setup, make sure num type is set to automatic
Thank you RoadRunner! I had it set to "BuildYourOwn" - No idea why. Now it works - Cheers!
Reference URL's
• HP Forums: https://www.hpmuseum.org/forum/index.php
• :