Error in plot.window(...) : need finite 'ylim' values

Most plot methods die with an error like this if all the values in y (or
x) are NA.  E.g., you get the same problem with
  plot(rep(NA, 10)) 
Remove the columns that are all NA's before trying to plot them.

Bill,

   Ah, so. I did not look to see if all the data frames that did plot had at
least one value in each column.

An ugly way of avoiding the error that stops you from seeing the
non-missing columns of the dataset is to replace plot.window with a
version that assigns an arbitrary value to xlim or ylim if they contain
illegal values:

Ugly is only skin deep; I'll take your advice on addressing this issue
with the two streams that fail to plot.

   There is still something I'm not doing properly because a lattice xyplot()
of TDS concentrations by time conditioned by sites on a stream show more
points than do the zoo line plots for the same stream. I assume that's not
correct. I need to look for the reason(s) for the differences, but I must
get a report revised and out to a client today so it will be at least
tomorrow before I'm back on this.

Thanks very much,

Rich