I would like to use plotmath to annotate a plot with an expression that includes a logical operator.
## works well tmp <- expression(x >= 3) plot(1) mtext(tmp) ## not so well tmp <- expression(x >= 3 & y <= 3) plot(1) mtext(tmp) Although the text that's displayed makes sense, it won't be obvious to my non-mathematical audience. I'd appreciate suggestions. I've found a work-around that gets the annotation to look right tmpw <- expression(paste( x >= 3, " & ", y <= 3) ) plot(1) mtext(tmpw) But it breaks my original purpose, illustrated by this example: df <- data.frame(x=1:5, y=1:5) tmp <- expression(x >= 3 & y <= 3) tmpw <- expression(paste( x >= 3, " & ", y <= 3) ) with(df, eval(tmp)) [1] FALSE FALSE TRUE FALSE FALSE with(df, eval(tmpw)) [1] "FALSE & TRUE" "FALSE & TRUE" "TRUE & TRUE" "TRUE & FALSE" "TRUE & FALSE" Thanks -Don -- Don MacQueen Lawrence Livermore National Laboratory 7000 East Ave., L-627 Livermore, CA 94550 925-423-1062 Lab cell 925-724-7509 ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
