Dear useRs, I'm trying to write a loop to sum my data in the following way: (the second - the first) + (the third - the second) + (the fourth - the third) + ... for each column.
So, I wrote something like this: c <- list() for(i in 1:ncol(mydata)) { for(j in 2:nrow(mydata)) { c[[i]] <- sum(yc[j,i] - yc[(j-1),i]) }}} As for the columns it works pretty fine, but it only returns the last subtraction, however, I need the sum of all subtractions. Any ideas? Regards, Rafael. Veja quais são os assuntos do momento no Yahoo! +Buscados [[alternative HTML version deleted]]
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