polyfix(x,y,n,xfix,​yfix,xder,dydx)

Version 1.3.1.2 (2.66 KB) by Are Mjaavatten
Fit polynomial p to data, but match exactly at one or more points
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(20)
4.4K Downloads
Updated 20 Jan 2020

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Sometimes we want to fit a polynomial to some data, but want to force a perfect match to some known values at one or more points. This function returns such a polynomial.

Cite As

Are Mjaavatten (2026). polyfix(x,y,n,xfix,yfix,xder,dydx) (https://se.mathworks.com/matlabcentral/fileexchange/54207-polyfix-x-y-n-xfix-yfix-xder-dydx), MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2012b
Compatible with any release
Platform Compatibility
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Version Published Release Notes
1.3.1.2

Changed image
1.3.1.1

Added image
1.3.1.0

Fixed the error in version 1.3.0.0 pointed out by Jacob Bresler.
1.3.0.0

As requested by Jacob Bresler, I have added optional outputs S and mu, to make the output from polyfix conform with polyfit
1.2.0.0

Fixed trivial errors in the help section
1.1.0.0

Version 1.1 includes an option for specifying derivatives. p is now a row vector, for consistency with polyfit
1.0.0.0