On Nov 8, 2009, at 7:23 PM, rusers.sh wrote:
for (i in num) {
c_num<-c[c$b==num,]
write.csv(c_num,file="c:/c_num.csv")
}
Warning messages:
1: In c$b == num :
longer object length is not a multiple of shorter object length
This is because you're comparing column b to the entire vector of
numbers (num), not the current number in the iteration (i). The first
line of the loop should be "c_num<-c[c$b==i,]".
From a style point of view, I'd use "n" as my variable, since "i" is
too commonly used as an integer index.
Also, you will be overwriting the same file, called "c_num.csv", on
each iteration.
You should try something more like:
for (n in num) {
c.n <- c[c$b==n,]
write.csv(c.n, file=paste("c:/c_", n, ".csv", sep="")
}
I hope that helps.
Cheers,
Johann Hibschman
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