Yes this what I meant. I think no need for this line h=listfile[[n]],if I can just put it directly in the other line to do the calculations for every file in my list.they are not really elements.they are files. what I need is just this:get the size of each file in my list then /67420/4,to get the number of rows and assign that to b . so now b will be used later as a loop. I tried this also: for (n in 1:length(listfile)).{ h=listfile[[n]] b=file.info(h[[n]])$size/67420/4 } then I got this :Error in h[[n]] : subscript out of bounds
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