See also this: https://cran.r-project.org/web/packages/latex2exp/vignettes/using-latex2exp.html
Bert On Thu, Feb 18, 2021 at 10:42 AM Bert Gunter <bgunter.4...@gmail.com> wrote: > Note, from ?plotmath: > > "Control characters (e.g., \n) are not interpreted in character strings in > plotmath, unlike normal plotting." > > For this reason, as best I can tell, you need to fool with plotmath's > "atop" command or do separate "labs" calls. This post seems to confirm > that opinion: > > > https://stackoverflow.com/questions/29112697/adding-a-newline-in-a-substitute-expression > > I certainly would welcome a better alternative. > > Cheers, > Bert Gunter > > "The trouble with having an open mind is that people keep coming along and > sticking things into it." > -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) > > > On Thu, Feb 18, 2021 at 9:37 AM Izmirlian, Grant (NIH/NCI) [E] via R-help < > r-help@r-project.org> wrote: > >> ## I am using ggplot and trying to produce a caption containing math >> symbols. I need to >> ## add a second line. I did a fair amount of googling for answers. This >> one seemed like >> ## it would answer my question as it is nearly exactly my problem, except >> there is only >> ## one argument to the paste function. Note that my example is a complete >> minimal >> ## example, just a scatterplot with a line, and the caption content seems >> to not have >> ## anything to do with the plot. That is of course, intentional. >> ## >> ## >> https://stackoverflow.com/questions/13223846/ggplot2-two-line-label-with-expression >> >> library(ggplot2) >> X <- 10*runif(100) >> Y <- 2*X + rnorm(100, sd=2) >> fit <- lm(Y~X) >> Y.p <- predict(fit, newdata=data.frame(X=X)) >> DAT <- data.frame(X=X) >> >> ## without a newline >> p <- ggplot(data=DAT, aes(x=X)) + geom_point(aes(y=Y)) + >> geom_line(aes(y=Y.p)) >> p <- p + labs(caption=expression(paste(P,"(",FDP,">", alpha,") ", >> "for 'FDR' and 'Auto' FDP control method, vs '", >> m, >> "' at levels of 'eff size' (col) and '", p[1], "' >> (row)"))) >> p <- p + theme(plot.caption = element_text(hjust = 0)) >> >> ## newline, method 1, just add a new component of paste containing "\n" >> somewhere in the middle >> p <- ggplot(data=DAT, aes(x=X)) + geom_point(aes(y=Y)) + >> geom_line(aes(y=Y.p)) >> p <- p + labs(caption=expression(paste(P,"(",FDP,">", alpha,") ", >> "for 'FDR' and 'Auto' FDP control method, vs '", >> m, >> "' at levels of 'eff size' (col) and '", p[1], "' >> (row)", >> "and \n a new line"))) >> p <- p + theme(plot.caption = element_text(hjust = 0)) >> >> ## doesn't work because the newline affects only the last component of >> paste. It looks like new line >> ## works if the line is long enough, but the newline character is being >> parsed until the individual >> ## arguments to paste are parsed for math symbols but prior to pasting >> the components together. prior >> ## to pasting all arguments. I can't imagine why this would be the >> desired behavior. When the value of a >> ## caption argument is expression(paste(s1, s2, s3, ...)) then parsing >> for a newline character should >> ## occur after the components are pasted together, right? >> >> ## newline, method 2, enclose paste in another paste and add the new line >> as the second argument of the >> ## outer paste >> p <- ggplot(data=DAT, aes(x=X)) + geom_point(aes(y=Y)) + >> geom_line(aes(y=Y.p)) >> p <- p + labs(caption=expression(paste(paste(P,"(",FDP,">", alpha,") ", >> "for 'FDR' and 'Auto' FDP control method, vs '", >> m, >> "' at levels of 'eff size' (col) and '", p[1], "' >> (row)"), >> "and \n a new line"))) >> p <- p + theme(plot.caption = element_text(hjust = 0)) >> >> ## which has the same behavior >> >> >> [[alternative HTML version deleted]] >> >> ______________________________________________ >> 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. >> > [[alternative HTML version deleted]] ______________________________________________ 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.
