Hello R-List
I've run into a minor problem with ggplot2. In particular, I get
an error message when trying to plot a horizonal line through zero.
Here is what I do:
plt.df <- subset(xfm.df, select=c(stage, subj, tX))
plt <- ggplot(pp.df, aes(x=stage, y=tX, group=subj)) + geom_line()
plt
plt <- plt + geom_hline(intercept=0)
plt
The first plot yields a most lovely graph. Addition of the
geom_hline yields ...
"Error in eval(expr, envir, enclos) : object "subj" not found"
The data.frame that I'm plotting looks like this ...
> str(plt.df)
'data.frame': 468 obs. of 3 variables:
$ stage: Factor w/ 12 levels "f1","f2","f3",..: 1 1 1 1 1 1 1 1 1 1 ...
$ subj : Factor w/ 39 levels "1","2","3","4",..: 1 2 3 4 5 6 7 8 9 10 ...
$ tX : num -0.00011 -0.44548 -0.39649 -0.19610 -0.46434 ...
I suspect that I'm likely doing something obviously wrong, but I
can't figure out what it might be. Any suggestions?
On an unrelated note, does anyone know how I might change the
default axis names in ggplot? I suspect it's aes-related, but not
quite sure.
Thanks,
-Jim
--
=================================
Jim Nikelski, Ph.D.
Postdoctoral Research Fellow
Bloomfield Centre for Research in Aging
Lady Davis Institute for Medical Research
Sir Mortimer B. Davis - Jewish General Hospital
McGill University
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