why does turningpoint return undefined?

Stefan shared this question 4 months ago
Answered

Hi, please see the attached example.


I tried to get the turning points in the function, but the command returns "undefined".


I of course can go via f'' , zero crossings and marking those points manually on f, but it seems such a hassle.


I have tried several functions from the school book and it always returns undefined, so I must be doing something wrong, but what?

Comments (6)

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InflectionPoint( <Polynomial> ) Yields all inflection points of the polynomial as points on the function graph.

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Hi, the "Vendepunkt" command in my example IS the InflectionPoint command. And in my example gbb, at least in my geogebra, this returns "undefined" for EVERY example function I tried. I have even tried to enter the functions instead of refering to it by name, to no avail.


So I must be doing - something - wrong here, but what?

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Well, I guess what you meant to say is "You can't use that command, because your function is not a polynomial". That couldn't have been any less clear from writing one word in bold, to me at least. Thanks anyway.

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try root(f'')

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Thank you, but I stated in my text that I know how to circumvent this by going to the root of the second derivative.


This does not solve my problem, that the InflectionPoint command returns "undefined" in every example I try.

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