Please read about panel functions in ?xyplot and ?panel.abline In particular, you do this sort of thing in panel functions where you must use grid graphics functions or various lattice forms (wrappers) thereof. The standard graphics constructions will not work (as you found out).Suggested reference: Deepayan Sarkar's new book on lattice graphics.
-- Bert Gunter Genentech -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Blanchard, Suzette Sent: Thursday, June 12, 2008 10:52 AM To: [email protected] Subject: [R] adding horizontal lines to a trellis plot I would like to add two horizontal lines representing acceptible drug levels to a trellis plot. I tried using abline and I get an error that "plot.new has not been called." See below. xyplot(FK~WEEK|Event1/MRN, data=FKdat.o1) abline(h=5) abline(h=10) Error in int_abline(a = a, b = b, h = h, v = v, untf = untf, ...) : plot.new has not been called yet Any help that can be provided on how to do this would be appreciated. Best, Suzette Suzette Blanchard, Ph.D. Assistant Professor, Dept. of Biostatistics City of Hope 1500 East Duarte Rd Duarte, CA 91010-3000 ph: (626) 256-4673 ext:64446 [EMAIL PROTECTED] --------------------------------------------------------------------- SECURITY/CONFIDENTIALITY WARNING: \ This message an...{...{{dropped:8}} ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
