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-boun...@stat.math.ethz.ch [r-sig-mac-boun...@stat.math.ethz.ch]
On Behalf Of steven mosher [mosherste...@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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