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Topic: BUG: Evaluate/Trace of a Function
Dear Ivan
Good morning;
I have been frequently faced a bug during using "Evaluating or Trace a Function" tools in high order polynomial curve fitting.
for example referring to attached Graph file, i put a set of point and fitted a 6th order polynomial. When i active Evaluate function tool and trace points, the slope of curve after x=46 grow up (in against of curve shape). Even in x~90 we expect f'(x)=0 but in Graph we see -53!!
Please guide me about this discrepancy.
Thanks so much
Re: BUG: Evaluate/Trace of a Function
I think you forgot to attach the gif file.
Re: BUG: Evaluate/Trace of a Function
Excuse me. I attached a Graph file with a picture that shows error of f'(x) around mentioned range.
Post's attachments
Bug(Tangant)2.grf 6.1 kb, 1987 downloads since 2016-08-23
bug.PNG 42.89 kb, 362 downloads since 2016-08-23
Re: BUG: Evaluate/Trace of a Function
I have located the cause of the problem and I am trying to fix it. Thanks for notifying me about this problem.
Re: BUG: Evaluate/Trace of a Function
I have fixed the problem in the latest beta version:
http://www.padowan.dk/beta/
The cause of the problem was that Graph decided that the first part of the function, 9.43137423E-09, was so small that it could be rounded to zero. This optimization was a little too agresive.
Re: BUG: Evaluate/Trace of a Function
Thank you for your helpful assiduity.
Best regards
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