How to graph a derivative on HP Prime?

09282014, 07:35 PM
(This post was last modified: 09282014 07:36 PM by mayradio0508.)
Post: #1




How to graph a derivative on HP Prime?
I'm currently taking a calculus course and I'm supposed to be able to graph a derivative of a function using a graphing calculator. The textbook says to input nDer(f(x),x) but I can't seem to figure it out. I've tried various things and sometimes it comes out as a line at y=0 but most of the things I've tried don't graph anything at all. Can someone explain to me how to graph a derivative of a function, such as f(x)= lnx?


09282014, 08:05 PM
Post: #2




RE: How to graph a derivative on HP Prime?  
10052014, 04:24 PM
Post: #3




RE: How to graph a derivative on HP Prime?
(09282014 07:35 PM)mayradio0508 Wrote: I'm currently taking a calculus course and I'm supposed to be able to graph a derivative of a function using a graphing calculator. The textbook says to input nDer(f(x),x) but I can't seem to figure it out. I've tried various things and sometimes it comes out as a line at y=0 but most of the things I've tried don't graph anything at all. Can someone explain to me how to graph a derivative of a function, such as f(x)= lnx? Two ways, you'll need the derivative template [Template Key, 1st row, 4th column] Let d represent the "curvy derivative symbol". Textbook entry: F1(X) = LN(X) F2(X) = (d F1(X))/(dX=X) or directly: F1(X) = (d LN(x))/(dX = X) Algebraic Entry: F1(X) = d( LN(X), X=X) 

10062014, 04:57 PM
(This post was last modified: 10062014 05:26 PM by Chris Pem10.)
Post: #4




RE: How to graph a derivative on HP Prime?
This seems like the most logical way to ask the calc to plot a function and its derivative... the syntax seems completely logical and "correct", but it just doesn't work.
But yeah; putting dX=X in the denominator works: Of course this works as expected in the CAS environment... but that's old news here. 

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