primarily due to reverse scores. But for some reason it seems to me that this can be much worse than using bigmat,
I just had an example with rstudio where it took a minute to do 1 x 3677 normalised scores. My suspicion is that it was actually some unrelated problem e.g. GUI update that was interleaved. These kind of error messages are typical when changing location with an X session in progress:
Tue Mar 18 14:32:29 mac1041-14.lmb.internal rsession[355] <Error>: kCGErrorIllegalArgument: CGSGetDisplayBounds (display 3f003d)
However, there is a still a more general speed issue to be tracked down since I have seen a behaviour where attaching an ff matrix to the global environment can bring access speed benefits.
primarily due to reverse scores. But for some reason it seems to me that this can be much worse than using bigmat,
I just had an example with rstudio where it took a minute to do 1 x 3677 normalised scores. My suspicion is that it was actually some unrelated problem e.g. GUI update that was interleaved. These kind of error messages are typical when changing location with an X session in progress:
However, there is a still a more general speed issue to be tracked down since I have seen a behaviour where attaching an ff matrix to the global environment can bring access speed benefits.