Yes, this is it (as would say michael)! Thank you guys! Last question about another function on this list: imagine this list is my data after your function for the regression model:
mydf <- data.frame(x=c(1:5), y=c(21:25),z=rnorm(1:5)) mylist <- rep(list(mydf),5) Don't care about this fake data, it's just for the example. I've my results in column "z" (from regression) for each DF of the list, and 2 other columns "x" and "y" representing some spatial coordinates. I have another independent DF containing a list of "x" and "y" too, representing some specific regions (imagine 10 regions): region <- data.frame(x=c(1:10),y=c(21:30),region=c(1:10)) The final aim is to have for each 10 regions, a value "z" (of my regresion) from the nearest point of each of the DF of my list. That means for one region: 10 results "z" from DF1 of my list, then 10 other results "z" from DF2, ... I already have a small function to look for the nearest value: min.dist <- function(p, coord){ which.min( colSums((t(coord) - p)^2) ) } Then, I'm trying to make a loop to havewhat I want, but I have difficulties with the list. I would need to put 2 variables in the loop, but it doesn't works. This works approximately if I just take 1 DF of my list: for (j in 1:nrow(region)) { imin[j] <- min.dist(c(plante[j,1],plante[j,2]),mylist[[j]][,1:2]) final[j] <- mylist[[j]][imin[j], "z"] final <- as.data.frame(final) } But if I select my whole list (in order to have one column of results for each DF of the list in the object "final"), I have errors. I think the first problem is that the length of "regions" is different of the length of my list, and the second maybe is about adding a second variable for the length of my list. Is there any solution? -- View this message in context: http://r.789695.n4.nabble.com/apply-a-function-separately-on-each-element-of-a-list-tp4641186p4641530.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.