Is the performance of comparing datetime datatypes slower than datenum
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I'm finding where a desired timestamp (`datetime`) fits within a large datetime array. However, this step takes a very long time and from the profiler, it appears most of the time is spent on datevec. Would it be faster to convert everything over to datenum values?
Currently the comparison step looks like this:
tol = duration(0,0,0,40);
time = datetime(timeIn);
idx = arrayfun(@(x) find(abs(x.time-time)<=tol),obj,'uni',0);
1 Comment
dpb
on 15 Jul 2016
What's the form of timeIn? What may help is to give the specific format; at one time (I believe/maybe still does?) datenum looked at each element if a format wasn't provided which was much slower than with the appropriate format.
I'd not be terribly surprised if as a rule datetime is somewhat slower than datenum simply because it's more capable as well as the object stuff will add some overhead as well, in all likelihood.
I can't test the comparative here, though...
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