Extending a line of best fit with delta

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azhao 2020-10-17

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https://ww2.mathworks.cn/matlabcentral/answers/617273-extending-a-line-of-best-fit-with-delta

评论： Adam Danz 2020-10-18

I have a datapoint at x=20,40,60,80,100 and I used polyfit to perform a linear fit. Say my polyfit equation is y_fit. In addition, I'm using polyval to find the normr values of the linear fit. From polyval, there's also a delta matrix generated. I'm trying to extend the line of best fit from x = 0 to x = 150 for the plots y_fit-2*delta and y_fit+2*delta from x = 0 to x = 150. What would be the best way to do so

Thanks :)

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Adam Danz 2020-10-18

If you use refline() the line will extend across the entire axes.

Otherwise, use the x values (0 and 150) as inputs to your linear function to get the y values. Then use the x and y values to plot a line using plot() or line().

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