R help - Nov 2007 - fitting a line to a logaritmic plot

Hi,

I have processed measurements of a rough surface to a heigh-height
correlation plot. What the meaning of this exactly is, is not important.
Only that it is a plot that had two (almost ) linear parts when plotted on a
logaritmic scale. In this plot, I want to draw the best fitting lines for
these linear parts but I just can't get it done. It is easy when the scales
are linear but as you might have imagined, the scales being logarithmic
don't add to the simplicity of my problem.
Thanks in advance!

Joren

	[[alternative HTML version deleted]]

Could you calculate the log values of the two
sections, fit the line, and use lines() to draw them?


--- Joren Heit <jorenheit at gmail.com> wrote:
> Hi,
> 
> I have processed measurements of a rough surface to
> a heigh-height
> correlation plot. What the meaning of this exactly
> is, is not important.
> Only that it is a plot that had two (almost ) linear
> parts when plotted on a
> logaritmic scale. In this plot, I want to draw the
> best fitting lines for
> these linear parts but I just can't get it done. It
> is easy when the scales
> are linear but as you might have imagined, the
> scales being logarithmic
> don't add to the simplicity of my problem.
> Thanks in advance!
> 
> Joren
> 
> 	[[alternative HTML version deleted]]
> 
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