haotu : an open lab notebook

2013/07/09

Angle axis x labels on R plot

Filed under: R, R graphics — S @ 04:13

1. First make a plot without the axis you want using xaxt="n":

plot(yy,xx,xaxt="n",xlab="")

2. Then add the axis without labels

axis(side=1,at=xx,labels=FALSE)

where:
side = 1 (this example is for adding labels to the x axis)

3. Finally add the text:

text(xx,par("usr")[3] - ofst, srt = g, adj = 1,labels=labs,xpd = TRUE)

where:
par("usr")[3] gives you the y coordinate for your x axis
ofst is the offset at which you want to plot the labels away from the x axis (note the minus sign).
srt = g this gives the angle to plot the labels, I like (e.g., g = 45)
labs is a vector of your labels
xpd=TRUE plotting clipped to the figure region, also try xpd=NA

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