I think you should rather look at the origin= parameter in barchart. See
?panel.barchart for a discussion of this exact problem:
" origin: the origin for the bars. For grouped displays with 'stack
=
TRUE', this argument is ignored and the origin set to 0.
Otherwise, defaults to 'NULL', in which case bars start at
the left (or bottom) end of a panel. This choice is
somewhat
unfortuntate, as it can be misleading, but is the default
for
historical reasons. For tabular (or similar) data, 'origin
=
0' is usually more appropriate; if not, one should
reconsider
the use of a bar chart in the first place (dot plots are
often a good alternative). "
The result of setting origin is more sensible:
require(lattice)
da <- expand.grid(A=c("a","b"), x=1:4)
da$y <- c(1,5,6,3,2,0,6,0)
barchart(y~x|A, data=da, horizontal=FALSE)
barchart(y~x|A, data=da, horizontal=FALSE, origin=0)
>>> Walmes Zeviani <walmeszevi...@hotmail.com> 14/01/2010 14:49:01 >>>
Rex,
I think this problem can be solved using xlim()/ylim() argument. Look
at the
follwing code:
require(lattice)
da <- expand.grid(A=c("a","b"), x=1:4)
da$y <- c(1,5,6,3,2,0,6,0)
barchart(y~x|A, data=da, horizontal=FALSE)
barchart(y~x|A, data=da, horizontal=FALSE,
ylim=c(0, 1.05*max(da$y)))
At your disposal.
Walmes.
Rex C. Eastbourne wrote:
>
> When I use barchart (with default formatting options), I get bars
whose
> lengths/heights are not proportional to their value. For example:
>
> http://drop.io/wbagm6s/asset/capture-png
>
> Many of the values in this chart are 1; however, because the blue
bars
> extend to the left of the "0" tick mark, those bars appear to
represent
> higher numeric values. Is there a way to make the length of the bar
> proportional to the data value, so that people looking at my chart
are not
> misled?
>
> Thanks,
>
> Rex
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>
-----
..oooO
..................................................................................................
..(....)... 0ooo... Walmes Zeviani
...\..(.....(.....)... Master in Statistics and Agricultural
Experimentation
....\_)..... )../.... walmeszevi...@hotmail.com, Lavras - MG,
Brasil
............
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