how to find a polynomial?
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shahul thaufeek
on 18 Jun 2018
Commented: Image Analyst
on 24 Jun 2018
i have data for x and y values,by using these how to find a polynomial X=0.042672375396118 and Y=-0.17386168 , -0.18001581 , -0.19355754 ,
4 Comments
Rik
on 18 Jun 2018
Actually you don't get corresponding values from polyfit. You get the parameters. So for a third order polynomial described as y=p1*x^3+p2*x^2+p3*x+p4, polyfit will return a vector p formed by p=[p1 p2 p3 p4];
And it does use the least-squares method, as you can read in the doc.
Rik
on 24 Jun 2018
Please don't use the answer field for comments, nor should you accept an answer if it doesn't solve your question.
If you have three sets of y-values and want to fit a single polynomial to your data, you need to replicate the x-values.
Accepted Answer
shahul thaufeek
on 23 Jun 2018
Edited: Image Analyst
on 24 Jun 2018
1 Comment
Image Analyst
on 24 Jun 2018
Looks like you figured it out yourself since you've accepted this answer. So I guess there's nothing left for us to answer or help you out with.
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