Plot derivative of a function

[CR Haeger]

(05-31-2014 02:47 PM)swisscow Wrote:  Hi all

I cannot seem to work out the following and would appreciate some help. In the FUNCTION app, I put some function in F1. What I would like to have is in F2 the calculator to work out the numerical derivative of F1 and therefore be able to plot the function and its derivative.

I don't want to put the actual derivative into F2 but something like F2(X)=diff(F1) (but obviously something that works). Then I could get my students to explore functions and slopes without having to be able to differentiate things that are beyond them.

I'm trying to avoid using any CAS because it is not permitted for the exam system I work within.

Many thanks

This seems to work:

F1(X)= SIN(X)
F2(X)= SLOPE(F1,X)

where SLOPE() is from Toolbox>App>Function>SLOPE (#5) and
F1 is from Vars>App>Function>Symbolic>F1 (#1)
or type SLOPE(), F1 in with Alpha...

** Teachable moment: looks about 57 times different if you are in degrees versus radians...