ha. thanks for a smart answer to a stupid question

On Thu, Sep 16, 2010 at 12:10 PM, Steven McKinney <smckinney@bccrc.ca>wrote:

> Hi Steven,
>
> Try
>
> abline(a = -1905/2, b = 0.5)
>
> R is "drawing" abline(a = 0, b = 0.5) but it is entirely off the screen as
> the x limits are 1900 to 1910.
>
> It appears that abline only works for b = 0 as those were your only
> attempts that yielded
> a line within the plot frame.
>
> Steven McKinney
>
> ________________________________________
> From: r-sig-mac-bounces@stat.math.ethz.ch [
> r-sig-mac-bounces@stat.math.ethz.ch] On Behalf Of steven mosher [
> moshersteven@gmail.com]
> Sent: September 16, 2010 12:04 PM
> To: r-sig-mac@stat.math.ethz.ch
> Subject: [R-SIG-Mac] stupid question on abline
>
> I must be missing something very obvious
>
>  data <-ts(rnorm(120,0,1),start=1900,frequency=12)
>  plot(data)
>  abline(a=0,b=1)
>
> # draws nothing
> abline(a=0,b=0)  #works
> abline(a=1,b=0)  #works
> abline(a=0,b=.5) # doesnt work
>
> abline will only draw if b=0
> > sessionInfo()
> R version 2.11.1 (2010-05-31)
> x86_64-apple-darwin9.8.0
>
> locale:
> [1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8
>
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  methods   base
>
> other attached packages:
>  [1] zyp_0.9-1         Kendall_2.1       rgdal_0.6-26      zoo_1.6-4
> ncdf_1.6          R.utils_1.5.0     uncompress_1.34   R.oo_1.7.3
>  [9] R.methodsS3_1.2.0 maps_2.1-4        raster_1.5-4      sp_0.9-66
>
> loaded via a namespace (and not attached):
> [1] grid_2.11.1    lattice_0.18-8 tools_2.11.1
> > abline(a=0,b=0)
>
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>
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>

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