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: [email protected] [[email protected]] On Behalf Of steven mosher [[email protected]] Sent: September 16, 2010 12:04 PM To: [email protected] 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) [[alternative HTML version deleted]] _______________________________________________ R-SIG-Mac mailing list [email protected] https://stat.ethz.ch/mailman/listinfo/r-sig-mac _______________________________________________ R-SIG-Mac mailing list [email protected] https://stat.ethz.ch/mailman/listinfo/r-sig-mac
