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- Date sulfate nitrate ID
- pollutantmean <- function(directory,pollutant,id = 1:332){
- means <- c()
- for(i in id){
- x <- paste(getwd(), "/", directory, "/", sprintf("%03d", i), ".csv", sep = "")
- freem <- read.csv(x)
- inte <- freem$pollutant
- print(class(frame$pollutant))
- means[i] <- mean(inte, na.rm = TRUE)
- }
- mean(means)
- }
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