Help with basic fitting

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aurc89
aurc89 2014-2-23
评论： Image Analyst 2018-9-25
Hello,I would like to fit a curve with a line and retrieve slope and intercept of this linear fit. Let x and y be the vectors which define the curve, which is already similar to a line; I plot x vs y, then from the plot window I select Tools --> Basic fitting --> Linear fit, then I press 'Show equation' so that from the expression y=mx + q I retrieve both the slope m and the intercept q. The problem is that I want to obtain immediatly m and q from the Matlab code, without doing it manually as discussed above. How can I do this ? Thanks

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Mischa Kim
Mischa Kim 2014-2-23
编辑：Mischa Kim 2014-2-23
Try
[p,S] = polyfit(x,y,1)
The two elements of p are the coefficients m and q you are looking for.
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Andrea Gómez Montoya
Andrea Gómez Montoya 2018-9-25
What is S on the answer?
Image Analyst
Image Analyst 2018-9-25
It's explained in the help for polyfit().

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Image Analyst
Image Analyst 2014-2-23
for what it's worth, I've attached a demo of polyfit.

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