possibly with unique = TRUE:
make.names(c("'", "'"))
[1] "X." "X."
make.names(c("'", "'"), unique=TRUE)
[1] "X." "X..1"
Spencer
On 9/2/2011 12:28 PM, Gustavo Carvalho wrote:
?make.names perhaps.
On Fri, Sep 2, 2011 at 4:13 PM, Durant, James T. (ATSDR/DTEM/PRMSB)
<h...@cdc.gov> 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?
VR
Jim
James T. Durant, MSPH CIH
Emergency Response Coordinator
US Agency for Toxic Substances and Disease Registry
Atlanta, GA 30341
770-378-1695
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Spencer Graves, PE, PhD
President and Chief Technology Officer
Structure Inspection and Monitoring, Inc.
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