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2006 Mar 07
7
reading in only one column from text file
How do I manipulate the read.table function to read in only the 2nd
column???
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2006 Mar 08
0
survival
...ea.
+ seth
readBatch <- function(con, batch.size) {
colClasses <- rep("character", 20) ## fix for your data
## adjust to pick out the columns that you want
read.csv(con, colClasses=colClasses, as.is=TRUE,
nrows=batch.size, header=FALSE)[, 1:2]
}
readTableStreamily <- function(filePath) {
BATCH_SIZE <- 5000 ## no idea what a good value is depends on file
and RAM
con <- file(filePath, 'r')
colNames <- readBatch(con, batch.size=1)
chunks <- list()
i <- 1
done <- FALSE
while (!done) {
done <-...