Murray:
You said that you wanted more control over the selection of lines than
scan() was giving you. This may have been suggested by someone else
(there have been a lot of messages in this thread!), but I think what
you want to do is to "roll your own" reader, using textConnection.
For example, if you want to read lines 1000 through 1100, you'd do it
like this:
lines <- readLines("foo.txt", 1100)[1000:1100]
result <- scan(textConnection(lines), list( .... ))
This will be inefficient with very large files if you want to read
every nth line or a block at the end of the file, because the first
line reads a contiguous block and then subsets. In that case you
probably want to write your own loop that builds up the lines variable
first.
Duncan Murdoch
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