# How to DISABLE automatic zeros, extrema, critical points?

Rulatir shared this question 3 years ago

I am trying to define a function that uses modulo arithmetic and ends up being piecewise constant. GeoGebra detects this as the function having an extremum for every value of the argument, and goes crazy and unresponsive trying to display all those points.

Is there a way to completely disable this functionality either for a function or globally?

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Hi Rulatir,

for help an example or a file would be nice. ;-)

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No. This is a super simple yes/no question about existence of a feature. I am not reporting a *problem* with geogebra detecting multiple spurious local maxima. I am asking how to *circumvent* the problem by *disabling* automatic numerical calculation of local maxima for a given function.

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1. No Mod() in functions.

2. No "*disabling* automatic numerical calculation"

4. what you are looking for its for me not really clear

especially the local maxima in the context with numeric calculation is not clear (for me)

maybe you mean "ignore Extremum with value y=0"

Then try: KeepIf(y(P)!=0 ,P, {Extremum( <Function>, <Start x-Value>, <End x-Value> )})

Note: the result is a list, not tested.

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@Rami

I think he means the "special" points automatically displayed in Version 6 and apps when you type in the equation of a function....

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Thanks Simona,

I look this later, when Version 6 is more complete and more robust (but it seems an interesting functionality)

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I have spend some time trying to get "extremum for every value of the argument" with the more strange functions without results

what is the function you posted?

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Just dropping by to emphasize that the question was "How to disable automatic calculation of extremes, and if it is not possible, please say so". It was not "How to modify my function so that the extremes detection feature, when enabled, won't be overtriggered". And it wasn't any other question either. The question I asked was the question I asked.

I asked a French teacher, "How do I say good evening in French?". "There is no equivalent" would be a good answer if it were true. "What's the context?" would be a good answer if it depended on the weekday or something. But neither is the case, and the only good answer is "Bonsoir". The situation with this question is very similar. The functionality to disable automatic calculation of extremes either exists in the software or it doesn't. It's a yes or no question, and if yes, how to. It does not "depend".

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2) don't be rude to other users

3) Please assume good intentions of everyone else here

If you can't do the above then you are not welcome on this forum