It worked for me, do you have the latest version of ggplot2 released a
few days ago (ggplot2_0.7) ?
Baptiste
On 9 Oct 2008, at 20:55, stephen sefick wrote:
Error in `[.data.frame`(df, , var) : undefined columns selected
I got this error in a fresh R session after rerunning all of the
commands
On Thu, Oct 9, 2008 at 3:45 PM, hadley wickham <[EMAIL PROTECTED]>
wrote:
On Thu, Oct 9, 2008 at 2:29 PM, stephen sefick <[EMAIL PROTECTED]>
wrote:
I am trying to figure out how to use ggplot2. I would like to do
the
below
with ggplot, but I can not figure out how. The data provided is a
subset
of
a much larger data set, but these data are the data necessary to
make the
plot. I think I would rather have the colors become symbols, and
I do
know
how to do that in lattice, but here is a quick and dirty version.
thanks
Here's one way:
pred <- data.frame(GPP = f, TSS = y)
qplot(TSS, GPP, data=r, colour=RiverMile) +
geom_line(data=pred, colour ="black")
* ggplot2 works with data frames, so the key is to create one from
your model predictions. Naming the variables to match the names of
the model inputs makes sense, and saves some typing.
* You no longer need to specify xlim because ggplot2 knows about
everything you are plotting and can calculate the limits
appropriately.
* You have have to manually set the colour in geom_line to override
the default mapping that you created between colour and RiverMile.
Hadley
--
http://had.co.nz/
--
Stephen Sefick
Research Scientist
Southeastern Natural Sciences Academy
Let's not spend our time and resources thinking about things that
are so
little or so large that all they really do for us is puff us up and
make us
feel like gods. We are mammals, and have not exhausted the annoying
little
problems of being mammals.
-K. Mullis
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