On Fri, 21 Oct 2011, David Winsemius wrote:
The last part ("in the same column") does not make sense, since I was
interpreting the term "parameter" to mean a value in a particular column.
Assuming these are R NA's then logical indexing:
with( chemdata, chemdata[!is.na(param1) & !is.na(param2) , ])
David,
I asked the question improperly. What I should have asked is how to
specify only non-missing values of a parameter to create a new subset.
Example (this includes NA rows):
tds.basin <- subset(chemdata, param == "TDS", select = c(param, quant, \
basin), drop = TRUE)
When I try to add '!is.na' with the param selection I get errors.
To be as specific as I should have been in my original message, how should
I write the above expression to exclude rows where "TDS" is missing?
Rich
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