polyfit and polyval problem
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Hi there,
I am trying to plot a line using the ployfit and command
x and y are the coordinates in attached xy the plot.
I can't plot a polyfit curve that reproduces the original.
I alway came up with something different from the original curve.
8 Comments
dpb
on 6 Dec 2019
"I got the y from a more complex equation, ..."
Well, there's the place to start. What makes sense to approximate whatever that is/was.
What restrictions are on the approximation used, if any?
Accepted Answer
Paul Rogers
on 6 Dec 2019
Edited: Paul Rogers
on 6 Dec 2019
5 Comments
Guillaume
on 6 Dec 2019
I'm not sure how many times we can say it, your curve is nothing like a polynomial and attempting to fit a polynomial to it is the wrong approach.
To me it looks like your curve may be a log-normal curve. Again, some information on what created that curve could tell you that.
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