MATLAB: Generate timestamp in millisecond interval for interpolation

datenuminterpolationmilliseconds interval;

how to generate timestamp 0.250 seconds (4Hz) sampling interval? I tried [firstdatenum:0.125/86400:enddatenum]', but it gave me four different intervals (using diff) in the order 10^-6 (it is very small indeed, but annoying). I need the timestamp to interpolate it with other timeframe with 8Hz sampling interval.

If anyone can help. Thanks.

Best Answer

http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F

You are not going to be able to get exactly 0.25 second intervals in time stamps, as 86400 is not an exact divisor of 1.

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MATLAB: How to convert 18 digits timestamp to readable date and time in MATLAB

This page may be useful.

Most likely, your timestamp is a .Net System.DateTime

>>ts = int64(634019142119225390);
>>dt = System.DateTime(ts);   %Note that you need to be on Windows for this to work
>>dt.ToString
ans = 
16/02/2010 00:00:00

MATLAB: Vector of decimal day

Here is one of many possible ways.

HOURSPERDAY    = 24;
MINUTESPERHOUR = 60;
MINUTESPERDAY = HOURSPERDAY * MINUTESPERHOUR;
firstDate = '2009-01-01';
lastDate  = '2009-04-01';
firstDatenum = datenum(firstDate,'yyyy-mm-dd');
lastDatenum  = datenum(lastDate, 'yyyy-mm-dd');
fourMinuteDatenumVector = (firstDatenum:4/MINUTESPERDAY:lastDatenum)';
fourMinuteTimestampVector = datestr(fourMinuteDatenumVector);

I wasn't quite clear on how you wanted the output. The variable fourMinuteDatenumVector is a MATLAB datenum format. The variable fourMinuteTimestampVector is a timestamp format. You can use the datestr() function to convert to many different formats.

Best Answer

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MATLAB: How to convert 18 digits timestamp to readable date and time in MATLAB

MATLAB: Vector of decimal day

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