[R] Change the text size of the title in a legend of a R plot.

Steven McKinney smckinney at bccrc.ca
Fri Apr 29 07:15:47 CEST 2011

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Victor Gabillon
> Sent: April-28-11 8:22 PM
> To: r-help at r-project.org
> Subject: [R] Change the text size of the title in a legend of a R plot.
> Hello,
> Is it possible to change the text size of the title in a legend of a R plot?
> I tried to directly change the title.cex argument but it seems not to work.
> Trying :
> Horizo <- c(1,2,6,10,20)
> legtext <- paste(Horizo,sep="")
> legend("topleft", legend=legtext,col=col,text.col=col,lwd=lwd,
> lty=lty,cex=1.1,ncol=3,title = "Horizons",title.col ="black",title.cex=1.4)

I haven't found any cex argument that works for just the legend title, but you
can get some modification of the title with the expression argument:

legend("topleft", legend=legtext,col=col,text.col=col,lwd=lwd, lty=lty,cex=1.1,ncol=3,
title = expression(bold("Horizons")),title.col="black")

Does that help?

Otherwise, you can of course figure out which functions do the legend plotting,
copy and modify those to get a title cex in place.

Steve McKinney

> gives the following error (sorry in french):
> Erreur dans legend("topleft", legend = legtext, col = col, text.col =
> col,  :
>    argument(s) inutilisé(s) (title.cex = 1.4)
> saying title.cex argument as been ignored.
> Thank you for helping.
> Victor
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