Its just a basic question. I am fitting lines to scatter points using polyfit. I have some cases where my scatter points have same X values and polyfit cant fit a line to it. There has to be something that can handle this situation. After all, its just a line fit.

I can try swapping X and Y and then fir a line. Any easier method because I have lots of sets of scatter points and want a general method to check lines.

Main goal is to find good-fit lines and drop non-linear features.

matlab numerical-methods curve-fitting polynomial-math
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