On Oct 17, 2012, at 1:29 PM, Rich Shepard wrote:
On Wed, 17 Oct 2012, David Winsemius wrote:
What exactly is being requested? Do you just need to learn how to
use the
subset parameter? I would not think that the conditioning syntax
would be
used when there were only one level desired.
David,
When I try
xyplot(quant ~ sampdate | era, data = sb.d, main = 'Antimony
Concentrations
by Time', ylab = 'Concentration (mg/L)', xlab = 'Time',
subset=era('Pre-Mining'))
this error is returned:
Error in eval(expr, envir, enclos) : could not find function "era"
But, 'era' is a factor in the data frame.
The syntax above works with bwplot() and I would like to understand
why
it's not working with xyplot().
What do you expect when you give xyplot only one panel's worth of data
and specify a multipanel formula?
--
David Winsemius, MD
Alameda, CA, USA
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