On 2012-10-23 15:39, Rich Shepard wrote:
On Tue, 23 Oct 2012, Bert Gunter wrote:
I believe you are misunderstanding what a barchart is (or maybe I do,
since I never use 'em). I believe that there should be one quant value for
each tclass and stream, and you have several.
Bert,
My first attempt at using barchart()
?panel.barchart
is the place to look for documentation for details of any lattice
display. Note especially the "horizontal" argument details (also in
?barchart).
I looked at the panel section in ?barchart but did not gain any insights
into why there are segments in the bars.
As Bert correctly points out, you have more than one quant value per
tclass/stream combination. You need to summarize your 1987-case
data.frame to a 56-case data.frame (8 levels of tclass and 7 levels
of stream). The easy way to do that is:
benthos2 <- aggregate(quant ~ tclass + stream, data = benthos,
FUN = sum)
Then just use benthos2 as the data argument to barchart().
Peter Ehlers
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