Hi Rich
Without a dataset I am not sure what you need.
Further down the track you will need to plot what you finally need
and this may help you decide what you need now
for finals try
library(lattice)
library(latticeExtra)
useOuterStrips(
xyplot(variable1 + variable2 ~ Date|Site, data = Data, groups = Groups, ...)
)
this will give you a matrix plot of the columns being the site and
the rows being the variables.
but for now if you have a large screen you can do a splom by sites
you may to subset sites.
use par.settings and levelplot settings to reduce the fontsizes etc
so that you can get as much information
splom( ...|Site, data= Data,...)
if you want to have 2 plots eg the x axis as time and another
independent variable
you can plot them on the page together
eg
plot1 <- xyplot(....)
plot2 <- density.plot(...)
print(p1, position= c(0,0,1,0.5), more = T)
print(p1, position= c(0,0.5,1,1), more = F)
see ?print.trellis
As usual everything depends on the data
HTH
Duncan
Duncan Mackay
Department of Agronomy and Soil Science
University of New England
Armidale NSW 2351
Email Home: mac...@northnet.com.au
At 09:41 21/10/2011, you wrote:
I'm not seeing how to plot the quantities associated with two values of a
factor by reading the ?xyplot help page and Deepayan's book. Perhaps I need
to generate many different subsets from the data frame, but that would
require _many_ new data frames.
The structure of the data frame (for a single stream) has sites (factor),
a date (as.Date), parameters (factor), and quantities (numeric). What I need
to do is produce scatter plots of the quantities associated with two
different parameters conditioned by site or by date (separate plots, I'm
sure).
I have 24 streams and initially need to look at the relationships of 5
different pairs of parameters (e.g., "Cond" and "TDS") for all sites and by
sites. Can I do this from the existing data frame?
It seems to me that a splom() could be ideal for this, but I still have
the question of how to specify quantities for two parameters to plot against
each other.
Rich
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