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what is the best fitting tool to a data with sharp change in slop?

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Abdulaziz Abutunis
Abdulaziz Abutunis on 9 Mar 2016
Commented: KSSV on 9 Mar 2016
Hi all,
I am attaching plot of plotted data and fitted curve to this data. The figure shows deviation at regions that have sudden change in slop. The functions I used are polyfit and polyval. Is there any other fitting function or technique that gives better fitting to the curve.
Thanks in advance Aziz

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