Import large files
The regular tools used to import CSV or Excel files do not work with “large” files[mfn]For instance, I couldn’t import a ~20Mb CSV file made of 480.000 rows.[/mfn].
I personally used
data.table. On top of importing large CSV files in a breeze, it also provides neat options for weirdly-formatted files (yes, I am looking at you, Mesa). Depending on your needs, another package may be of a better help (see sources).
data <- fread("data.csv")
data is not an actual data frame. You may need to convert it.