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Topic: Comparison of time entries
Replies: 11   Last Post: Apr 25, 2012 1:33 PM

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Barry Williams

Posts: 312
Registered: 6/14/06
Re: Comparison of time entries
Posted: Apr 25, 2012 9:55 AM
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"Johannes " <> wrote in message <jn8tto$t29$>...
> First of all thanks for your really quick answers!
> But I saw, that I haven't made myself clear enough and I even discovered a bad mistake in my problem described above.
> My original problem is what follows:
> start = datenum('14:32:41','hh:mm:ss') = 7.358125838078704e+005
> end = datenum('15:00:49','hh:mm:ss') = 7.348386255671296e+005
> end - start = -9.739582407408161e+002
> So I get for the later time a value that's smaller than that for the earlier time. How is that possible?

Read doc datestr for permitted formats, then compare the results of using:
datenum('14:32:41','hh:mm:ss') and datenum('14:32:41','HH:MM:SS')

Your problem will also be apparent if you use datestr to reverse your original entries, e.g., datestr(7.358125838078704e+005) and datestr(7.348386255671296e+005).
You will notice that they fall in different years because of the difficulty that Matlab has interpreting your format.

As another matter, avoid using a keyword, like end, as a variable.


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