On Jan 4, 2012, at 3:21 PM, Rich Shepard wrote:
On Wed, 4 Jan 2012, David Winsemius wrote:
Nothing attached. I don't know what you entitled teh compressed
dput output but it did not pass the filters of the mailserver and
you did not copy me.
David,
It must have been stripped off as too large (14K).
Regardless, I solved the problem:
The examples in the subset help page show only a single row criterion
being used, but does not explicitly note that rows can be selected
only one
criterion at a time.
Because that is simply not true. Connect your criteria with ampersands
and you can have as many as you want. The only requirement is that the
logical vector that results be exactly the number of rows in the
dataframe as described in the help page.
Because the issue showed up only with the subset() function to
extract
rows with the parameter TDS, the problem had to be in that syntax. By
changing the data frame argument to subset() from the overall
chemdata to
that of only a single stream, creation of the zoo object threw no
errors and
duplicated() returned zero rows.
Wow! And I thought I understood the subset() syntax. I now do!
Thanks to you, Gabor, and everyone else who responded to this thread,
Rich
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David Winsemius, MD
West Hartford, CT
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and provide commented, minimal, self-contained, reproducible code.
