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Re: Undefined value during function evaluation

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Thank you Karl, 
I will cancle the b, you are right. 
But the angles are no Problem, because there are no angles in my data. I use the arcustangens to get the angle and then insert it into the sinus. So arctan((x-d)/e) is the angle and gnuplot will charge it in radiands. (x-d) and e have the unit mm, and their unit does not matter, because they cancle. But maybe there is a problem with the "big" sinus... 
(sin((pi*b*sin(atan((x-d)/e)))/c))**2
Could be, you are right. 
I will change to degree and try again, thank you.

And yes, the function is already close to the data before fitting.

I have to use this funktion for my data, there is no easier one for this problem.  

Anna

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Undefined value during function evaluation schmidtanna114@gmail.com - 2017-06-27 06:54 -0700
  Re: Undefined value during function evaluation Karl Ratzsch <mail.kfr@gmx.net> - 2017-06-27 18:01 +0200
  Re: Undefined value during function evaluation schmidtanna114@gmail.com - 2017-06-27 12:40 -0700
  Re: Undefined value during function evaluation Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2017-06-27 21:44 +0200
  Re: Undefined value during function evaluation schmidtanna114@gmail.com - 2017-06-28 07:16 -0700

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