Hi,
Try to use aggregate function
RSiteSearch ("aggregate") #for help
Regards
ML
A Ezhil a écrit :
Dear All,
I have matrix (50000 X 60) of subjects and their responses to a set of
questions. All responses are classified into categories (500). I would like to
average all subject's responses for each category. I wrote a code using a for
loop but is not working. Could please tell me what's wrong with the code? I
guess, there is a elegant R way of doing the same thing.
Thanks in advance.
Kind regards,
Ezhil
j <- 1; n <- dim(dat)[1]; cat <- as.character(dat[,1]);
row <- matrix(nrow=nrow(dat), ncol=ncol(dat));
for(i in 1:n-1) {
if(cat[i] != cat[i+1]) {row[j, ] <- dat[j, ]}
else {
start <- j;
end <- i;
}
row[j, ] <- colMeans(dat[j:i, ]);
j+1;
}
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