How to read every .csv file in R and export them into single large file

Question

Hi so I have a data in the following format

101,20130826T155649
------------------------------------------------------------------------
3,1,round-0,10552,18         


        

Answer 1

You can use lapply to read all the files, clean and format them, and store the resulting data frames in a list. Then use do.call to combine all of the data frames into single large data frame.

# Get vector of files names to read
files.to.load = list.files(pattern="csv$")

# Read the files
df.list = lapply(files.to.load, function(file) {
   df = read.table(file, sep = ',', fill=TRUE, col.names=paste("V", 1:18,sep=""))
   ... # Cleaning and formatting code goes here
   df$file.name = file  # In case you need to know which file each row came from
   return(df)
})

# Combine into a single data frame
df.combined = do.call(rbind, df.list)