All,
I'm trying to order the rows according to several columns at a time:
DT <- data.table(a = 1:4, b = 8:5)
for (i in c("a", "b"))
print(DT[order(i), with = FALSE])
It doesn't work, since `with` seems to be about the `j` argument, but
not the `i` argument, according to `?data.table`.
I found the following workaround, but wonder whether there is a more
elegant way to do it:
for (i in c("a", "b"))
print(DT[order(DT[, i, with = FALSE])])
Thanks,
M
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