faster version of split()?

you might try to iteratively read a limited number of line of lines in a
batch using readLines:

# filename, the name of your file
# n, the maximal count of lines to read in a batch
connection = file(filename, open="rt")
while (length(lines <- readLines(con=connection, n=n))) {
  # do your stuff here
}
close(connection)

?file
?readLines

vQ


Gundala Viswanath wrote:

Dear all,

I have a repository file (let's call it repo.txt)
 that contain two columns like this:

# tag  value
AAA    0.2
AAT    0.3
AAC   0.02
AAG   0.02
ATA    0.3
ATT   0.7

Given another query vector

qr <- c("AAC", "ATT")

I would like to find the corresponding value for each query above,
yielding:

0.02
0.7

However, I want to avoid slurping whole repo.txt into an object (e.g. 
hash).
Is there any ways to do that?

The reason I want to do that because repo.txt is very2 large size
(milions of lines,
with tag length > 30 bp),  and my PC memory is too small to keep it.