Error in file(file, "rt") : cannot open the connection

Error in file(file, "rt") : cannot open the connection

To solve the R "Error in file(file, "rt") : cannot open the connection," change your working directory.

Here is an example of how the error occurs:

pollutantmean < - function (directory, pollutant = "nitrate", id = 1: 332) {
  if (grep("specdata", directory) == 1) {
    #⛔️ Error in file(file, "rt"): cannot open the connection
    directory < -("./specdata")
  }
  mean_polldata < -c()
  specdatafiles < -as.character(list.files(directory))
  specdatapaths < -paste(directory, specdatafiles, sep = "")
  for (i in id) {
    curr_file < -read.csv(specdatapaths[i], header = T, sep = ",")
    head(curr_file)
    pollutant
    remove_na < -curr_file[!is.na(curr_file[, pollutant]), pollutant]
    mean_polldata < -c(mean_polldata, remove_na)
  } {
    mean_results < -mean(mean_polldata)
    return (round(mean_results, 3))
  }
}

Change directory <- ("./specdata") to directory <- ("./specdata/").

If you are using RStudio and this solution does not work, try changing the working directory directly in RStudio.

1. Go to Session
2. Go to Set Working Directory
3. Click Choose Directory ...

A window will pop up where you can choose the folder where you are storing your file.

Conclusion

To solve the R "Error in file(file, "rt") : cannot open the connection," change your working directory.