Prevent row names to be written to file when using write.csv?

Question

Commands: t <- data.frame(v = 5:1, v2 = 9:5) write.csv(t, "t.csv")Resulting file: # "","v","v2" # "1",5,9 # "2",4,8 # "3",3,7 # "4",2,6 # "5",1,5How do I prevent first column with row index from being written to the file?

Answer 1

By default, row names are included when you export a data frame to a CSV file with the write.csv() function. To turn off this option, set the row.names argument within the function to FALSE. (This argument tells R not to include the row names when creating (or exporting) the data frame.)

For example:

Let's assume you have a data frame called t:

t <- data.frame(v = 5:1, v2 = 9:5)

To export t to the current working directory without row names, write:

write.csv(x = t, file = "t.csv", row.names = FALSE)

Where x is the data frame you want to export; file is the filename (including extension; .csv in this case) you assign to the exported data frame; and the row.names argument is set to FALSE.