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I am trying to import a permanent SAS data set using read.ssd in the foreign library. I get the following error: > list.files("C:/temp") [1] "newdat1.sas7bdat" "snpm1.sas7bdat" "test1.sas" > library(foreign) > newdat1 <- read.ssd("C:/temp","newdat1") SAS failed. SAS program at

Hi, I got caught out by this behaviour in 1.8.0 and I wondered why this happens: I have a list of vectors and was using lapply and grep to remove matched elements that occur in only a subset of the elements of the list: locs <- lapply(locs, function(x){x[- grep("^x", x)]}) The problem is that where the grep finds no matches and hence returns a vector of length 0, all the