[R] Find the function of a line

[Sarah Goslee]

lm()?
Or simple geometry?

lm(c(a,b) ~ c(xx[yy==a],xx[yy==b]))

will give you the slope and the intercept.

Sarah

On Wed, Jun 29, 2011 at 5:38 AM, Ida Dolciotti <ida.dolciotti at ufz.de> wrote:
> Hello everybody,
>
> I have drawn a line in a x y plot  that links the minimum and maximum points
> in the plot
>
> plot(xx,yy)
>
> a=max(yy)
> b=min(yy)
>
> lines(c(xx[yy==a],xx[yy==b]),c(a,b))
>
> Now I would like to know if it is possible to extrapolate the characteristic
> of the line (intercept and slope).
>
> Is it there and appropriate function for this?
>
> Thanks for your help!
>
> Ida D.
>
> --

-- 
Sarah Goslee
http://www.functionaldiversity.org