Help with basic fitting
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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
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.
2 个评论
Andrea Gómez Montoya
2018-9-25
What is S on the answer?
Image Analyst
2018-9-25
It's explained in the help for polyfit().
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Image Analyst
2014-2-23
1 个投票
for what it's worth, I've attached a demo of polyfit.
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