I am attempting to perform some simple data manipulation on a large data
set. I have a snippet of the whole data set, and my small snippet is 2GB in
CSV.
Is there a way I can read my csv, select a few columns, and write it to an
output file in real time? This is what I do right now to a small test file:
data <- read.csv('data.csv', header = FALSE)
data_filter <- data[c(1,3,4)]
write.table(data_filter, file = "filter_data.csv", sep = ",", row.names =
FALSE, col.names = FALSE)
This test file writes the three columns to my desired output file. Can I do
this while bypassing the storage of the entire array in memory?
Thank you very much for the help.
--
Jason
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