Bar chart error

[waschbaer]

Hi

I am new to R and I just came across a problem with using the ggplot2
package. I have been trying to make a plot using geom_bar and
facet_grid. This plot should show two bars for each ID and for each
variable, where each bar should represent the value for the dry and
wet season. I have pasted an example of the code as well as the error
message I get below. Maybe someone has an idea what I am doing wrong?
Thanks for your help in advance.

Martin

melt_meansbyseason <- read.csv("http://dl.dropbox.com/u/4236038/
molten_nutrients.csv")
ggplot(melt_meansbyseason, aes(x=ID, y=Value, fill=Season)) +
geom_bar() + facet_grid(Variable~.)

Error message
stat_bin: binwidth defaulted to range/30. Use 'binwidth = x' to adjust
this.
stat_bin: binwidth defaulted to range/30. Use 'binwidth = x' to adjust
this.
stat_bin: binwidth defaulted to range/30. Use 'binwidth = x' to adjust
this.
stat_bin: binwidth defaulted to range/30. Use 'binwidth = x' to adjust
this.
Error in pmin(y, 0) : object 'y' not found

[Xie Chao]

I think you want this:

ggplot(melt_meansbyseason, aes(x=ID, y=Value, fill=Season)) +

geom_bar(stat='identity', position='dodge') + facet_grid(Variable~.)

Xie Chao

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[waschbaer]

That was exactly what I wanted to have. Thanks for the gread help.

Cheers
Martin