Creating a polynomial data set
6 views (last 30 days)
Show older comments
Hi all,
im currently trying to create a polynomial output of my data, basically i have a data set containing time (in seconds ( X axis)) and a tide height in meters ( Y axis) when plotted the tide data over the time series is very noisy due to wave / wind action on the vessel changing the elevation of the recording device.
so to account for this i wish to create a fitted polynomial data set under a new variable name which i can output independently of the original tide variable. this will also account for times where my measuring devise failed and im interpolating data
so far to evaluate which degree of polynomial best fits the data set i have been using the code'
poly3=(fit(time,tide,'poly3','Normalize', 'on'); % clearly i change the 'poly3' value depending upon the degree i need
this works fine for estimating a best fit from a plot of the above variable, but how do i get from this point to creating an adjusted tide height using the polynomial curve i have created.
Regards Gavin
0 Comments
Accepted Answer
More Answers (1)
Jos (10584)
on 24 Jan 2014
Take a look at POLYFIT and POLYVAL as well:
PFpar = polyfit(time, tide, 3)
AdjustedTide = polyval(PFpar,time)
0 Comments
See Also
Categories
Find more on Polynomials in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!