MATLAB: Find the point of the polyfit curve intersecting the x axis

Question

Hello,

I used the polyfit function to generate a slope across my 2d data points. However, I want to store the value of x, at which this curve intersects the x axis, thus ('something',0).

Any idea how to get this point? All i see is the y intercept, and the slope of the line., not the x intercept

Answer 1

use interpolation again... Let (x,y) be the points you have.

When curve intersects 'x' axes. y = 0.

xi = interp1(y,x,0) ;