Dear friends - here is an example of something that I find annoying
library(ggplot2)
DDF <- data.frame(x=x<-seq(1,10),y=x^2)
G <- ggplot(data=DDF,aes(x=x,y=y)) + geom_point()
GG<-G+ylab(expression(paste("Total ",CO[2]," halved")))
GG
GG+annotate("text",x=5,y=50,label=expression(paste("Total ",CO[2],"
halved")))
On my system, R version 3.3.2 (2016-10-31) Windows - the third line
produces the wanted formatting of CO2 with "2" lowered - while the last
line produces an error "invalid 'type' (expression) of argument" - with
exactly the same string - how comes?
Beautiful ggplot is not exactly low in documentation but finding the
right stuff is not always easy (for me:-))
Best wishes
Troels Ring, MD
Aalborg, Denmark
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