Find the point of the polyfit curve intersecting the x axis

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Tushar Agarwal
Tushar Agarwal 2016-10-26
评论： KSSV 2016-10-26
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

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KSSV
KSSV 2016-10-26
use interpolation again... Let (x,y) be the points you have.
When curve intersects 'x' axes. y = 0.
xi = interp1(y,x,0) ;
  2 个评论
Tushar Agarwal
Tushar Agarwal 2016-10-26
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
KSSV 2016-10-26
Check for x(y==0); It will give multiple values.Pick what you want.

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