[R] The "condition has length > 1" issue for lists

[Svempa]

I have the following code:

list1 <- list()
for (i in list.files(pattern="filename1")){
    x <- read.table(i)
	list1[[i]] <- x
}

list2 <- list()
for (i in list.files(pattern="filename2*")){
    x <- read.table(i)
	list2[[i]] <- x
}

anslist <- vector('list', length(list1)) 
for(i in 1:length(list1)) 
if (list1[[i]] & list2[[i]] >1)
anslist[[i]] <- list1[[i]] - list2[[i]]

That, if at least one element in either of the lists is below 1, nothing
happens. I now get the warning message "the condition has length >1..." etc.
I would guess this is because list1 and list2 aren't really real matrices,
more references to files. How do I get around this?

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