Why is datenummx(clock) faster than now()?

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Why is running datenummx(clock) 4x faster than the standard now() call? https://gist.github.com/4432190

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per isakson
per isakson on 2 Jan 2013
Edited: per isakson on 2 Jan 2013
The function, now, has one executable line of code
t = datenum(clock);
the function, datenum, calls the function, datenummx, after having done error checking, etc.
That's why.
per isakson
per isakson on 3 Jan 2013
Edited: per isakson on 3 Jan 2013
I often find it difficult to understand the rational behind various design decisions of The MathWorks (TMW). Since, TMW is successful in the money-making industry, I guess TMW knows what they are doing.
Regarding datenummx I guess it is possible to make a faster function (little error checking, one OS (Windows only), maybe "in-place".) Post a new question.

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