Title is missing in 1st boxplot when using a for loop

Question

I am trying to plot 16 boxplots, using a for loop. My problem is, that the 2nd title is plotted on the first plot, the 3rd title on the second plot and so forth.

Does anyone have a guess on, what I am doing wrong?

My code is the following:

boxplot(data$distance[data$countryname=="Sweden"]~data$alliance[data$countryname=="Sweden"],title(main = "Sweden"))
boxplot(data$distance[data$countryname=="Norway"]~data$alliance[data$countryname=="Norway"],title(main = "Norway"))
boxplot(data$distance[data$countryname=="Denmark"]~data$alliance[data$countryname=="Denmark"],title(main = "Denmark"))
boxplot(data$distance[data$countryname=="Finland"]~data$alliance[data$countryname=="Finland"],title(main = "Finland"))
boxplot(data$distance[data$countryname=="Iceland"]~data$alliance[data$countryname=="Iceland"],title(main = "Iceland"))
boxplot(data$distance[data$countryname=="Belgium"]~data$alliance[data$countryname=="Belgium"],title(main = "Belgium"))
boxplot(data$distance[data$countryname=="Netherlands"]~data$alliance[data$countryname=="Netherlands"],title(main = "Netherlands"))
boxplot(data$distance[data$countryname=="Luxembourg"]~data$alliance[data$countryname=="Luxembourg"],title(main = "Luxembourg"))
boxplot(data$distance[data$countryname=="France"]~data$alliance[data$countryname=="France"],title(main = "France"))
boxplot(data$distance[data$countryname=="Italy"]~data$alliance[data$countryname=="Italy"],title(main = "Italy"))
boxplot(data$distance[data$countryname=="Spain"]~data$alliance[data$countryname=="Spain"],title(main = "Spain"))
boxplot(data$distance[data$countryname=="Portugal"]~data$alliance[data$countryname=="Portugal"],title(main = "Portugal"))
boxplot(data$distance[data$countryname=="Germany"]~data$alliance[data$countryname=="Germany"],title(main = "Germany"))
boxplot(data$distance[data$countryname=="Austria"]~data$alliance[data$countryname=="Austria"],title(main = "Austria"))
boxplot(data$distance[data$countryname=="Ireland"]~data$alliance[data$countryname=="Ireland"],title(main = "Ireland"))
boxplot(data$distance[data$countryname=="UK"]~data$alliance[data$countryname=="UK"],title(main = "UK"))

use a loop or equivalent or you won't enjoy summer a lot this year ;-) — Vincent Bonhomme, May 22 '16 at 15:07

score 1 · Answer 1 · edited May 23 '17 at 10:28

1

I think this could replace all your lines and fix your problem:

for (i in data$countryname)
  boxplot(distance~alliance, subset(data, countryname==i), main=i)

But that's hard to verify without a reproducible example or some of your data.frame.

edited May 23 '17 at 10:28

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answered May 22 '16 at 15:10

Vincent Bonhomme

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awesome, but for loop is missing curly braces – Edward R. Mazurek May 24 '16 at 02:26
@Edward: no need for braces when what follows `for` (but not only `for`) is a single command – Vincent Bonhomme May 24 '16 at 05:16

score 0 · Answer 2 · answered May 22 '16 at 15:00

Based on the documentation, you should be assigning a title to your boxplots by making explicit calls to the function title(), rather than as a parameter in the call to boxplot(). The first two calls to generate your boxplots should look something like the following:

boxplot(data$distance[data$countryname=="Sweden"]~data$alliance[data$countryname=="Sweden"])
title(main = "Sweden")
boxplot(data$distance[data$countryname=="Norway"]~data$alliance[data$countryname=="Norway"])
title(main = "Norway")

just `boxplot(..., main="your_title")` would work as fine? – Vincent Bonhomme May 22 '16 at 15:08 — Vincent Bonhomme, May 22 '16 at 15:08

Title is missing in 1st boxplot when using a for loop

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