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2012 Mar 15
2
Ggplot barchart drops factor levels: how to show them with zero counts?
Hello,
When plotting a barchart with ggplot it drops the levels of the factor for
which no counts are available.
For example:
library(ggplot)
mtcars$cyl<-factor(mtcars$cyl)
ggplot(mtcars[!mtcars$cyl==4,], aes(cyl))+geom_bar()
levels(mtcars[!mtcars$cyl==4,])
This shows my problem. Because no counts are available for factorlevel '4',
the label 4 dissapears from the plot. However, I
2011 Mar 27
1
run function on subsets of matrix
...gh different 'factor' levels
for (i in unique(fac))
print(apply(m[fac==i,],2,mean))
Now, the problem is that if a value in 'fac' only occurs once, the
'apply' function will complain.
But I think, this can also be written more cleverly using some R style
construct using factorlevels.
Thanks