Dear Prof. Eduardo, Try this:
rot<-expression(paste("DGL growth (cm.yr"^"-1",")")) boxplot(five$gr13~five$Code, xlab="Species code", ylab=rot) In this page there are some useful mathematical annotations in R: http://stat.ethz.ch/R-manual/R-patched/library/grDevices/html/plotmath.html Best wishes, Carlos Rivera -----Mensaje original----- De: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] En nombre de eduardo van den Berg Enviado el: martes, 29 de mayo de 2012 17:24 Para: r-help@r-project.org Asunto: [R] Boxplot superscript y-axis Dear list, I need to include in a superscript number (-1) in a y-axis label of a boxplot graphic. I tried the following line: >boxplot(five$gr13~five$Code, xlab="Species code", ylab=substitute(paste("DGL growth (cm.yr"^{-1},")"))) It returns the following error message: Error in "DGL growth (cm.yr"^{ : non-numeric argument to binary operator I used the same line for the plot function in another graphic and it worked perfectly well. Any suggestions? -- Prof. Eduardo van den Berg Dpto. de Biologia - Universidade Federal de Lavras Cx. P. 3037 37200-000, Lavras, MG, Brasil Tel 35-3829-1917 E-mail eduardo.lav...@gmail.com [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org 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. ______________________________________________ R-help@r-project.org 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.