Hi Chris,
You can use scale_x_discrete() to manually set the locations of the
ticks (the breaks argument) and what they are labeled with (the
labels argument). If you want a third of the the ids (or so) you
could do something like:
breaks = factor(bb.res.math$id.bb)[seq(1, length(bb.res.math$id.bb), by = 3)]
and just change the sequence to skip as many as you want. Of course,
you can fully customize it and manually pick each and every id if you
really want.
HTH,
Josh
P.S. There is a mailing list specifically for ggplot2 on google groups.
On Sat, Jul 9, 2011 at 7:12 AM, Christopher Desjardins desja...@umn.edu wrote:
Hi,
I have the follow ggplot2 code I am running:
ggplot(data=bb.res.math,aes(x=factor(id.bb),y=bb.math.comb,fill=BB)) +
geom_bar() + facet_grid(BB~.) + scale_fill_brewer(pal=Set1) + ylab(Average
Student Residual (Math)) + xlab(Student ID)
The number of unique id.bb is 2207 and so my X-axis has a couple of
thousands, indistinguishable tick marks that correspond to each id. I am
wondering if there is a way to suppress these tick marks?
Here is some test data:
test
id.bb bb.res.m bb.math.comb BB
1 2900 1 -3.0032235 BB
2 2904 1 -1.8758770 BB
3 3469 1 0.8182852 BB
4 4213 1 -2.0660215 Not BB
5 4215 1 -4.8622086 BB
6 4395 1 0.8873996 Not BB
ggplot(data=test,aes(x=factor(id.bb),y=bb.math.comb,fill=BB)) + geom_bar() +
facet_grid(BB~.) + scale_fill_brewer(pal=Set1) + ylab(Average Student
Residual (Math)) + xlab(Student ID)
Gives the following graph:
http://dl.dropbox.com/u/1501309/ggplot2_suppress_ids.pdf
I'd like to prevent 2900, 2904, 3469, etc. from showing up on the
X-axis.
Thanks,
Chris
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Joshua Wiley
Ph.D. Student, Health Psychology
University of California, Los Angeles
https://joshuawiley.com/
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