Dear R Experts, I am trying to produce a legend for a series of plots which are generated in a loop. The legend is supposed to look like this:
2000: gamma=1.8 where gamma is replaced by the greek letter and both the year and the value of gamma are stored in variables. Everything works fine as long as I have only one data series: year = 2001 g = 1.9 plot(1) legend('top', legend=substitute(paste(year, ': ', gamma, '=', g), list(year=year, g=g)) ) My problem starts, when I want to put more than one series of data in the plot and accordingly need one legend row per data series: year1 = 2001 year2 = 2005 g1 = 1.9 g2 = 1.7 plot(1) legend('top', legend=c( substitute(paste(year, ': ', gamma, '=', g), list(year=year1, g=g1)), substitute(paste(year, ': ', gamma, '=', g), list(year=year2, g=g2)) ) ) This obviously does not produce the desired result. Apparently, I am not generating a list of expressions, as intended. So I thought, maybe R uses a variety of the recycling rule here and tried: year = c(2001, 2005) g = c(1.9, 1.7) plot(1) legend('top', legend=list( substitute(paste(year, ': ', gamma, '=', g), list(year=year, g=g)), ) ) No succes, either... I have read and re-read the documentation for legend, expression, substitute and plotmath but can't figure it out. Even drinking a cup of tea prepared from fine-cut man page printouts didn't lead to satori. I'm probably missing something simple. Any hints are highly appreciated. Thanks Philipp -- Dr. Philipp Pagel Tel. +49-8161-71 2131 Dept. of Genome Oriented Bioinformatics Fax. +49-8161-71 2186 Technical University of Munich 85350 Freising, Germany http://mips.gsf.de/staff/pagel ______________________________________________ R-help@stat.math.ethz.ch 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.