vector of decimal day

Is it possible to create a vector of decimal days?

I want to generate a time vector which starts and ends at specific dates and has an interval of 4 minutes between each time (in decimal day). For example: start on the first of jan 2009 and end on the 30th of April 2009 with a time stamp of 4 minutes between each time stamp!

Answer 1

[the cyclist]

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.