The problem is that the way you are using "*apply", there are
individual calls to the function for each item. In the direct
indexing, you are only making a single call with a vector of values;
Here is a illustration that shows the number of calls:
> # count the calls
> f.test <- function(x) callC
Hello,
I've been dealing with a set of values that contain time stamps and part
of my summary needs to look at just weekend data. In trying to limit the
data I've found a large difference in performance in the way I index a
data frame. I've constructed a minimal example here to try to explain
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