[R] a function more appropriate than 'sapply'?

emorway emorway at usgs.gov
Sat Jan 26 19:43:42 CET 2013

I'm wondering if I need to use a function other than sapply as the following
line of code runs indefinitely (or > 30 min so far) and uses up all 16Gb of
memory on my machine for what seems like a very small dataset (data attached
in a txt file  wells.txt
<http://r.789695.n4.nabble.com/file/n4656723/wells.txt>  ).  The R code is:


The 2nd line of R code above gets bogged down and takes all my RAM with it:

I'm simply trying to extract all of the lines of data that have a single "_"
in the first column and place them into a dataset called "wells2".  If that
were to work, I then want to extract the lines of data that have two "_" and
put them into a separate dataset, say "wells3".  Is there a better way to do
this than the one-liner above?


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