Dumb piloting question
01-16-2017, 06:24 AM
Post: #4
 cyrille de brĂ©bisson Senior Member Posts: 1,047 Joined: Dec 2013
RE: Dumb piloting question
Hello,

The best way is to use the CAS as described above. you can even simplify by doing F2:=F1'

This is best because it is the least amount of work and because the calculation of the function for drawing will be very fast...

Else, you can enter F2 as
d(F1(X))/d(X=X)
where d is the derivative symbol (use the template in the template key)....

I know that it might look strange at first, but you need to realize that the evaluation of d(F1(X))/d(X) is a FUNCTION, not a number! hence, if you were using this as a definition of F2, in every point, F2 would evaluate to a function and not to a number.
in fact, the X in the F1(X) and the first X are NOT the same as the X on the right side of the = sign... that X is the X that the function is evaluated for, the other is the derivative variable.

Best would be to enter d(F1(A))/d(A=X) or something like that, but this is more keys :-)

note, that this solution is slower as the derivation has to be performed for every point!

Cyrille

Although I work for the HP calculator group, the views and opinions I post here are my own. I do not speak for HP.
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 Messages In This Thread Dumb piloting question - lrdheat - 01-14-2017, 07:33 PM RE: Dumb piloting question - Eddie W. Shore - 01-14-2017, 10:41 PM RE: Dumb piloting question - Han - 01-14-2017, 10:45 PM RE: Dumb piloting question - cyrille de brĂ©bisson - 01-16-2017 06:24 AM RE: Dumb piloting question - lrdheat - 01-16-2017, 03:33 PM RE: Dumb piloting question - lrdheat - 01-20-2017, 12:03 AM RE: Dumb piloting question - Geoff Quickfall - 01-20-2017, 05:56 AM RE: Dumb piloting question - d b - 01-20-2017, 07:30 AM RE: Dumb piloting question - StephenG1CMZ - 01-20-2017, 06:08 PM RE: Dumb piloting question - Geoff Quickfall - 01-20-2017, 07:55 AM RE: Dumb piloting question - lrdheat - 01-20-2017, 09:57 PM