On Mar 23, 2011, at 3:44 PM, Sashi Challa wrote:
Hi Jim,
That is what I ended up doing. Each of my 1000 files has ~1 million
rows, and 19 columns and it was taking 85 secs for every file to be
just read into R.
All I needed to do was replace one column with a particular vector
values. So wanted to know if there was a way to do it without
reading all the columns.
Learn to use awk?
Thanks for your time,
Sashi
-----Original Message-----
From: jim holtman [mailto:jholt...@gmail.com]
Sent: Wednesday, March 23, 2011 11:50 AM
To: Sashi Challa
Cc: r-help@r-project.org
Subject: Re: [R] Modifying a particular column in a tab-delimited file
Read the whole file in, modify the column and then write the file
back out.
On Wed, Mar 23, 2011 at 12:03 PM, Sashi Challa <cha...@ohsu.edu>
wrote:
Hello R users,
Good day!!
I was wondering if there is a way in R to read in a particular
column from a tab-delimited file, edit it and write it back into
the file with all other columns intact. When I say edit I mean just
replacing all the values in that column.
I know to read a particular column from a file using colClasses
option in read.delim() function.
Is there any such option to write out a column into an already
existing file using write.table() function ??
Thanks for your time
-Sashi
David Winsemius, MD
West Hartford, CT
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