I'm struggleing with a problem long since. I highly appreciate any help with this theme.
The problem is the following:
- I have a set of points, what comes from a numerical solution of a complex, but periodical function. Therefore I have a set of points (X;Y). The points are doesn't matter, but in my case, it look like this:
I want to use the Fourier-method to approximate this points with a function.
The best result I could get is this:
But it is not acceptable due to the high inaccuracy at the starting, and finishing points (there is a diagram inaccuracy %):
I'm feel like, I'm doing something wrong. Unfortunately, I had no time to look deep into the math here. Can somebody tell me, that how can I get a better result, using this method?
Thank you very much for the help in advance.