Boldfacing Plot Legend with words, numbers, and symbols in R

Question

I'm wondering how to boldface the entire phrase: " 95% CI: [number 1 , number 2 ] " as a legend in my plot below? ( Note: "number 1" and "number 2" are specified in my code below).

Here is my R code which requires a fix:

plot(1:10,ty="n",bty="n")

legend("topleft", legend=bquote(paste(bold("95% CI: [ ", .(round(.4432, 3)), 
", " , .(round(.0034, 3))," ]"))), 
                 bty="n", inset=c(0,.03))

PS If I omit the bold() part from the code, the entire phrase shows normally, but I loose the bolding effect.

Answer 1

Two options/workarounds:

1. You can bold() each literal string individually, but I don't know how to bold the dynamic portions (eg, .(round(.4432,3)) ). This would look like:

    plot(1:10,ty="n",bty="n") legend("topleft", legend=bquote(paste(bold("95% CI: [ "), .(round(.4432, 3)), bold(", ") , .(round(.0034, 3)), bold(" ]"))), bty="n", inset=c(0,.03)) 

   The numbers are not bold.

2. With this label/legend, you don't actually need bquote , so you can use the text.font option of legend to bold the whole string:

    plot(1:10,ty="n",bty="n") legend("topleft", legend=paste("95% CI: [ ", round(.4432, 3), ", " , round(.0034, 3), " ]"), bty="n", inset=c(0,.03), text.font=2) 

   The disadvantage with this is that you are you able to use math symbols.

The text.font is a legend -specific argument for the more-generic font parameter, found in ?par :

 'font' An integer which specifies which font to use for text.  If
      possible, device drivers arrange so that 1 corresponds to
      plain text (the default), 2 to bold face, 3 to italic and 4
      to bold italic.  Also, font 5 is expected to be the symbol
      font, in Adobe symbol encoding.  On some devices font
      families can be selected by 'family' to choose different sets
      of 5 fonts.