Hi,
Try this;
lapply( mydata, function(x){
sum( diff( x ) )
} )
Romain
Rafael Moral wrote:
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]]
------------------------------------------------------------------------
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
--
Romain Francois
Independent R Consultant
+33(0) 6 28 91 30 30
http://romainfrancois.blog.free.fr
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
