[R] Conditional read-in of data

[mnstn]

Hello All,
I have a 40k rows long data set that is taking a lot of time to be read-in.
Is there a way to skip reading even/odd numbered rows or read-in only rows
that are multiples of, say, 10? This way I get the general trend of the data
w/o actually reading the entire thing. The option 'skip' in read.table
simply skips the first n rows and reads the rest. I do understand that once
the full data set (40k rows) is read-in, I can manipulate the data. But the
bottle-neck here is the first read/scan of data.

I searched in the forum using key words (conditional skip/skip reading
rows/skip data/conditional data read) etc. but couldn't find relevant
conversations. I apologize if this has already been discussed since it does
seem hard to imagine that nobody has come across this problem yet.

Any suggestions/comments are welcome.
Thanks,
mnstn
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