Thank you for your guys reply for my previous question. But I got one more
question about the boxplot. With the code in the R-help:
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", 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"))
I got 6 boxplots, which is ordered as "0.5, 0.5, 1, 1, 2, 2"
How can I reorder the 6 boxplots as "0.5, 1, 2, 0.5, 1, 2"?
Thank you very much!
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I just changed the 'at' argument and added an 'xlim' option.
boxplot(len ~ dose, data = ToothGrowth,
boxwex = 0.25, at = 1:3,
subset = which(supp == "VC"), col = "yellow",
main = "Guinea Pigs' Tooth Growth",
xlab = "Vitamin C dose mg",
ylab = "tooth length", xlim=c(1, 6), ylim=c(0, 35),
yaxs="i")
abline(v=3.5)
boxplot(len ~ dose, data = ToothGrowth, add = TRUE,
boxwex = 0.25, at = 1:3 + 3,
subset = which(supp == "OJ"), col = "orange")
legend("bottomright", c("Ascorbic acid", "Orange
juice"),
fill = c("yellow", "orange"))
Regards, Adai
cathelf wrote:> Thank you for your guys reply for my previous question. But I got one more
> question about the boxplot. With the code in the R-help:
>
> 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", 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"))
>
> I got 6 boxplots, which is ordered as "0.5, 0.5, 1, 1, 2, 2"
> How can I reorder the 6 boxplots as "0.5, 1, 2, 0.5, 1, 2"?
>
> Thank you very much!
on 09/12/2008 10:07 AM cathelf wrote:> Thank you for your guys reply for my previous question. But I got one more > question about the boxplot. With the code in the R-help: > > 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", 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")) > > I got 6 boxplots, which is ordered as "0.5, 0.5, 1, 1, 2, 2" > How can I reorder the 6 boxplots as "0.5, 1, 2, 0.5, 1, 2"? > > Thank you very much!Here is one approach: # Create a new DF, adding a column with the interaction of supp and # dose. DF <- cbind(ToothGrowth, SD = interaction(ToothGrowth$supp, ToothGrowth$dose, lex.order = TRUE)) # Note DF$SD and the ordering of the factor levels, which is # the order of the boxes in boxplot()> DF$SD[1] VC.0.5 VC.0.5 VC.0.5 VC.0.5 VC.0.5 VC.0.5 VC.0.5 VC.0.5 VC.0.5 [10] VC.0.5 VC.1 VC.1 VC.1 VC.1 VC.1 VC.1 VC.1 VC.1 [19] VC.1 VC.1 VC.2 VC.2 VC.2 VC.2 VC.2 VC.2 VC.2 [28] VC.2 VC.2 VC.2 OJ.0.5 OJ.0.5 OJ.0.5 OJ.0.5 OJ.0.5 OJ.0.5 [37] OJ.0.5 OJ.0.5 OJ.0.5 OJ.0.5 OJ.1 OJ.1 OJ.1 OJ.1 OJ.1 [46] OJ.1 OJ.1 OJ.1 OJ.1 OJ.1 OJ.2 OJ.2 OJ.2 OJ.2 [55] OJ.2 OJ.2 OJ.2 OJ.2 OJ.2 OJ.2 Levels: OJ.0.5 OJ.1 OJ.2 VC.0.5 VC.1 VC.2 # Now do the boxplot boxplot(len ~ SD, data = DF, boxwex = 0.25, at = c(1:3, 5:7), xlim = c(1, 7), col = c(rep("orange", 3), rep("yellow", 3))) legend("topleft", c("Ascorbic acid", "Orange juice"), fill = c("yellow", "orange")) See ?interaction for more information. HTH, Marc Schwartz