R: positioning of the legend and length of the lines in the legend

r graphics legend legend-properties
Irene picture Irene · Oct 14, 2013 · Viewed 10.8k times · Source

I can't set the location of the legend properly, I have tried to play around with xjust and ncol but it still appears in the middle of the graphic.

Can you help it align it to the border (left or right I do not care)?

Moreover is it possible to draw shorter lines in the legend? These appear too long.

 par(mar=c(5,4,4,5)+.1)
 plot(1:109,rnorm(109), type="l",col="blue", lwd=2, 
      main="Compare signal and std deviation MC3 ch44",
      ylab="signal", xlab="locations")
 par(new=TRUE)
 plot(1:109, rnorm(109), ylab="",xlab="", type="l", 
      col="red",xaxt="n",yaxt="n", lwd=2)
 axis(4)
 mtext("std. deviation",side=4,line=3)
 legend("topright",col=c("blue", "red"), lwd=2,
        legend=c("signal","std dev"), cex=0.85, bty="n", xjust=1)

Answer

Irene picture Irene · Oct 14, 2013

As pointed out in the comments restarting an R session and using 

legend("topright",col=c("blue", "red"), lwd=2,
 legend=c("signal","std dev"), cex=0.85, bty="n", xjust=1, seg.len=0.5)

solved my problems.

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