you could use a loop but maybe easier would be
x<-c(NA,x)
y<-c(y,NA)
t<-x*y
use write.table() to write the table to your hard drive
e.g.
write.table(t, file="C:/Documents and Settings/simonp/My Documents/RELU/GIS
data/Land Cover Map working/squares plus adjoining parcels/Scotland/scotland
adj squares.csv", sep = ",",row.names = F)
HTH, Si.
----- Original Message -----
From: "Carletto Rossi" <nuovo...@gmail.com>
To: <r-help@r-project.org>
Sent: Tuesday, June 02, 2009 11:22 AM
Subject: [R] newbie help: simple operations in R
Hi, i' d like to use R for simple calculations. I show you an examples to
make clear my help request
I' ve a file .csv like this (my real file is composed by 10.000 lines and
8
columns)
x y
3 4
1 7
I' ve imported in R correctly. Now i want create a new variable named "t"
and t is defined throught this relation:
t = 4 (second element on x column) * 4 (first element on y column)
in what way can i calculate t and print its value on an external file or,
better, append t values as a column on my original csv???
Thanks
Emanuele
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