Hi,
to hide the axis generated by bxp you have to set axes=FALSE and
frame.plot=FALSE and then you can plot the x-axis by using the axis()
function
example:
boxplot(len ~ dose, data = ToothGrowth,
frame.plot=FALSE,axes=FALSE,
boxwex = 0.25, at = 1:3 - 0.2,
subset = supp == "VC", col = "yellow",
main = "Guinea Pigs' Tooth Growth",
xlab = "Vitamin C dose mg",
ylab = "tooth length",
xlim = c(0.5, 3.5), ylim = c(0, 35))
boxplot(len ~ dose, data = ToothGrowth, add = TRUE,
frame.plot=FALSE,axes=FALSE,
boxwex = 0.25, at = 1:3 + 0.2,
subset = supp == "OJ", col = "orange")
axis(1,at=0:4)
axis(2,at=(0:17)*2)
legend(2, 9, c("Ascorbic acid", "Orange juice"),
fill = c("yellow", "orange"))
Theresa
Tim Clark wrote:
Dear List,
I am creating a boxplot with two subsets, very similar to the example by Roger
Bivand at ?boxplot (reproduced below). I am trying to change the labels on the
x-axis to have one number to cover both subsets. I can do this in other plots
by using axis=FALSE followed by a separate axis() command. I have also tried
variations in the names= argument but can't get it to work. Ideally I would
like tickmarks on either side of each factor with the number for the level
centered between the two tick marks. Any suggestions?
Thanks,
Tim
Example:
boxplot(len ~ dose, data = ToothGrowth,
boxwex = 0.25, at = 1:3 - 0.2,
subset = supp == "VC", col = "yellow",
main = "Guinea Pigs' Tooth Growth",
xlab = "Vitamin C dose mg",
ylab = "tooth length",
xlim = c(0.5, 3.5), ylim = c(0, 35), yaxs = "i")
boxplot(len ~ dose, data = ToothGrowth, add = TRUE,
boxwex = 0.25, at = 1:3 + 0.2,
subset = supp == "OJ", col = "orange")
legend(2, 9, c("Ascorbic acid", "Orange juice"),
fill = c("yellow", "orange"))
Tim Clark
Marine Ecologist
National Park of American Samoa
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