On Sep 2, 2011, at 3:13 PM, Durant, James T. (ATSDR/DTEM/PRMSB) wrote:
Greetings -
I am working on some data that contain chemical names with air
concentrations, and I am creating a data frame with date/time and
each chemical having its own column. However, these are organic
chemicals (e.g. 1-butene, 2,3,4-trimethylbenzene etc). The package I
am going to be using the data with is openair, and many of the great
functions require you to specify a column name which does not seem
to work with improper column names- e.g. smoothTrend(mydata,
pollutant="1-Butene" and smoothTrend(mydata, pollutant=mydata[,"1-
Butene"])
I was wondering if there was a function to automatically convert
these chemical names (with all sorts of numbers and minuses in the
beginning) to something openair can handle? Or am I going to be
stuck recoding several hundred chemical names in my database?
Try using back-ticks on the invalid names, rather than quotes.
--
David Winsemius, MD
West Hartford, CT
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