[R] Second y-axis --- alternative to par(new=

[cls59]

cls59 wrote:
> 
> 
> # recovering par('xaxp') uses the original x limits.
> plot.window( xlim = range( par('xaxp')[1:2] ), ylim = range( density(x)$y
> )) 
> 
> 

Actually, I misspoke. I believe the following is the voodoo you want for
exactly recovering the original xlimit:


  plot.window( xlim = range( par('usr')[1:2] ), xaxs = 'i', ylim = range(
density(x)$y )) 


Basically, par('xaxp')[1:2] only returns the extreme values of the tick
marks on the original x-axis-- using these can still cause points not to
line up. par('usr')[1:2] returns the coordinates of the left and right edges
of the plot screen. setting xaxs to 'i' causes R to use the xlimit exactly
as given and not to pad it by 4% in an attempt to make it "pretty".

Good luck!

-Charlie

-----
Charlie Sharpsteen
Undergraduate
Environmental Resources Engineering
Humboldt State University
-- 
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