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Hi all, I have attached the function file (revisedfunction) and the list of station IDs (StationIDs) in .pdf format. I have written a function to perform various operations on the station IDs in two groups. The first 6 station IDs require one less step than the remaining 68 station IDs. The file referenced at the beginning of the function is the file containing the StationIDs. > file =

...Factors = FALSE, na.strings = "NA") retval <- as.data.frame(tmp, stringsAsFactors = FALSE) return(retval) } This is an example of the data that is stored in the "info_n.csv" file. There are 92 total sites in this file. site.no flowstation.no shortName dec.lat.va dec.long.va drainSqKm areaUnits drainSqKmFlow areaUnits staAbbrev param.nm paramShortName constitAbbrev param.units 2169570 2169570 Gills Creek at Columbia, SC 33.98960016 -80.97425727 152.7543752904 2 152.7543752904 2 GillsColumSC Total nitrogen, water, unfiltered, milligrams per liter Nitrate as N TN mg/L <span...