R File I/O Capability - Writing output to specific lines of existing file
With only 600 lines, it is relatively easy to read it in and replace
some lines. For example (untested) is you wanted to replace lines
150:250 with your data, you would do
input <- readLines('filename')
input <- c(input[1:149], newData, input[251:length(input)])
writeLines(input, file='filename')
That does not seem too hard.
On Thu, Apr 9, 2009 at 12:26 AM, Jason Rupert <jasonkrupert at yahoo.com> wrote:
Darn. I was afraid of this. ?Always kind of weak when it comes to file I/O approaches, so I guess I will have to stretch and try to put something together. Yeah. ?The input flat text file is about 600 lines long. ?I will be replacing about 200. ?I already have the template for those 200 lines. ?I guess I will just need to read down to line 400 and replace until line 600. Thanks again for all the insights regarding this. --- On Wed, 4/8/09, jim holtman <jholtman at gmail.com> wrote:
From: jim holtman <jholtman at gmail.com> Subject: Re: [R] R File I/O Capability - Writing output to specific lines of ?existing file To: jasonkrupert at yahoo.com Cc: R-help at r-project.org Date: Wednesday, April 8, 2009, 8:02 PM You can always read in the initialization file, make the updates to it and then write it back out. ?If it is a text file, it would be very hard to write into the middle of it since there is no structure to the file. ?You can read it in as a table (read.table) or just as lines (readLines) and the make any changes you want. ?You can use regular expressions if you want to put something in the middle of one of the lines you have read in. On Wed, Apr 8, 2009 at 10:13 AM, Jason Rupert <jasonkrupert at yahoo.com> wrote:
Currently I am using the R "write" command
to output results to a *.txt file and then copying those results into an initialization file. ?In an attempt to continue to automate the process I would like to have R write to the location in the existing initialization file, instead of me copying the data over.
By any chance are there any R commands to help? Primarily, I will be using Windows, and the
initialization file is a simple flat file, i.e. not XML or binary.
I looked at: (a)
(b)
http://search.r-project.org/cgi-bin/namazu.cgi?query=File+I%2FO&max=100&result=normal&sort=score&idxname=functions&idxname=Rhelp08
But, this did not appear to provide the functionality
to edit an existing file by adding information to the middle of the file.
Thank you again for any help and insight.
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