Re: [R] How to emulate perl style of reading files ?

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Thu, 03 Jul 2008 15:42:45 +0100 (BST)

You use connections -- see the 'R Data Import/Export Manual'. Something like

con <- file("test1", "r")
while(length(a <- readLines(con, 1))) print(a) close(con)

On Thu, 3 Jul 2008, Daren Tan wrote:

>
> I tried the following, obviously it didn't work. Hope you get my point, how to do it in R ? My objective is to read a large fasta file (but not storing the entire data into memory) , and compute some sequence composition statistics.
>
> while(a <- readLines("test1") != EOF) print(a)
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PLEASE do

-- 
Brian D. Ripley,                  ripley_at_stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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Received on Thu 03 Jul 2008 - 14:58:06 GMT

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