On Aug 18, 2011, at 12:03 AM, Kota Hattori wrote:
Hi all,
I would like to ask a question with regard to R graphics. I am
currently
trying to add data points in boxplots using points(). In my script,
I add
up boxplots three times using add=TRUE. I use points() every time I
add
boxplots, and I see data points. However, I see all data points are
clustered
at three specific points on x-axis; the locations of the data points
are not overlapping with intended boxplots. This is because I use
"at" in boxplot(). Is there any way that I can specify the locations
of the
data points on x-axis? It would be great if there is something like
"at" in points(). Thank you for your help.
`boxplot` should return the values at which the midpoints of bars are
being plotted. Take a look at str(<your-boxplot-call>). It's probably
the $x component that you want to extract. `boxplot.stats` can also be
used. You should either use plot=FALSE with boxplot or use
boxplot.stats to gather the locations that can be used as x values
(perhaps with jitter) in calls to points.
The scripts are not much use without data.)
Cheers,
Kota
The following is my script.
boxplot(F2.E$D.value ~ F2.E$consonant,
main = "F2",
ylim = c(-4,10),
ylab = "Sensitivity (d')",
xlab = "Discrimination Type",
names = (c("E","E","E")),
col = "light grey",
border = "grey",
boxwex = 0.2,
at = 1:3 - 0.27
)
points(jitter(rep(1:3, each = 8),0.1),
unlist(split(F2.E$D.value,F2.E$consonant)),
cex = 0.5,
pch = 16)
boxplot(F2.J.pre$D.value ~ F2.J.pre$consonant,
add = TRUE,
col = "light grey",
border = "grey",
names = (c("J Pre","J Pre","J pre")),
boxwex = 0.2,
at = 1:3 - 0)
points(jitter(rep(1:3, each = 28), 0.1),
unlist(split(F2.J.pre$D.value,F2.J.pre$consonant)),
cex = 0.5,
col = "blue",
pch = 16)
boxplot(F2.J.post$D.value ~ F2.J.post$consonant,
add = TRUE,
col = "light grey",
border = "grey",
names = (c("J Post","J Post","J Post")),
boxwex = 0.2,
at = 1:3 + 0.27)
points(jitter(rep(1:3, each = 28), 0.1),
unlist(split(F2.J.post$D.value,F2.J.post$consonant)),
cex = 0.5,
col = "green",
pch = 16)
David Winsemius, MD
West Hartford, CT
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