[newbie] read row from file into vector

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Tom Roche
Sent: Thursday, December 29, 2011 2:08 PM
To: r-help at r-project.org
Subject: Re: [R] [newbie] read row from file into vector


Tom Roche 11-12-29 3:51 PM

E.g., for a file such that

$ head -n 2 ~/data/foo.csv | tail -n 1

5718,0.3,0.47,0,0,0,0,0,0,0,0,0.08,0.37,0,0,0.83,1.55,0,0,0,0,0,0,0,0,0,0.
00,2.48,2.33,0.17,0,0,0,0,0,0,0.00,10.69,0.18,0,0,0,0

I'd like to be able to populate a vector 'v' s.t.
v[1]=5718, ... v[43]=0

Duncan Murdoch Thu, 29 Dec 2011 16:45:45 -0500

x <- read.csv("foo.csv", nrow=1)
x <- as.numeric(x[1,])  # convert to numeric vector

Aha!

William Dunlap Thu, 29 Dec 2011 21:49:13 +0000

Look into connection objects, which let you open a file or other
readable sort of thing and read it piece by piece.

Will do, since what I plan to use R for (mostly) is manipulating very
large netCDF files.

thanks, all! Tom Roche <Tom_Roche at pobox.com>