7.27 How can I create rotated axis labels?
To rotate axis labels (using base graphics), you need to use
text()
, rather than mtext()
, as the latter does not support par("srt")
.## Increase bottom margin to make room for rotated labels par(mar = c(7, 4, 4, 2) + 0.1) ## Create plot with no x axis and no x axis label plot(1 : 8, xaxt = "n", xlab = "") ## Set up x axis with tick marks alone axis(1, labels = FALSE) ## Create some text labels labels <- paste("Label", 1:8, sep = " ") ## Plot x axis labels at default tick marks text(1:8, par("usr")[3] - 0.25, srt = 45, adj = 1, labels = labels, xpd = TRUE) ## Plot x axis label at line 6 (of 7) mtext(1, text = "X Axis Label", line = 6)
When plotting the x axis labels, we use
srt = 45
for text rotation angle, adj = 1
to place the right end of text at the tick marks, and xpd = TRUE
to allow for text outside the plot region. You can adjust the value of the 0.25
offset as required to move the axis labels up or down relative to the x axis. See ?par
for more information.
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