使用R图中的结果值在图中用下标和上标标记一条线

Question

I worked out some results and obtained a value (VALUE) with asymmetric errors (UERROR, and LERROR). I would like to have a label for a R plot using these values. With symmetrical errors, I an easily get the expression for the label as follows label<-paste(VALUE,"±",ERRORS) For the asymmetric errors, I am not sure how to proceed to have have the +error as a superscript and the - error as a subscript. I have tried label<-paste(VALUE[LERROR]^UERROR) but I get a label with "NA". I would like to be complete to add a "+" and a "-" in front of the appropriate errors and complete the expression with the units "kg". I am really a total novice at R but am sure this is possible having seen simultaneous subscripts and superscripts built with R but manually entered values. K^2[t] etc. Really intrigued as how to proceed. Thanks for helping!

Answer 1

Use bquote :

value <- 1
upr <- 1.2
lwr <- 0.5

plot.new()
text(0.5, 0.5, bquote(.(value)[.(lwr)]^.(upr)), cex = 10)

However, I wouldn't understand this notation without further explanation.

See also help("plotmath") for further advice regarding mathematical annotations in plots.