Find the point of the polyfit curve intersecting the x axis

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

[KSSV]

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

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

xi = interp1(y,x,0) ;

[Tushar Agarwal]

Thanks. However, what should I do if there are more than 1 values for y=0? I get an error for some of the plots saying 'only unique values'

[KSSV]

Check for x(y==0); It will give multiple values.Pick what you want.