On Dec 6, 2011, at 5:53 PM, Steve E. wrote:
Bill (and David),
Thank you very much for taking the time to respond to my query.
You were right, I was creating and calling the function exactly as
you had
predicted. I revised the structure based on your suggestion. It
runs but
the output is an array of the flags that are not attached to the
data frame,
not a new column in the data frame as was my intention.
So, the new configuration I tried was like this (where DataFrame is
not a
real data frame but just the word "DataFrame"):
WQFlags <- function(DataFrame) {DataFrame$CalciumFlag <-
with(DataFrame,
ifelse(variable == "CaD_ICP", (dataqualifier <- c("Y", 'Q', "", "A")
[findInterval(DataFrame$value, c(-Inf, 0.027, 0.1, 100, Inf))]),""))
}
I called it using:
WaterQualityData <- WQFlags(WaterQualityData)
Unless you provide either the original data or an unambiguous ( at the
level the R interpreter would see, not at the level of what you see
when you print a dataframe) description of your data you will get at
the very best educated guesses. Use str() or dput().
Again, the output is simply an array of the flags, unattached to a
data
frame. Can you suggest a way to modify this to make it work as
desired, or,
in the worst case, can I attach the resulting array of flag values?
Do you mean "attach" in the sense of using the R function `attach`? If
so, then please do not. (And please ignore any advice or the examples
concerning that issue you might get from reading Crawley's text.)
--
Good night.
David Winsemius, MD
West Hartford, CT
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