Creating timeseries using date num

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Poulomi Ganguli 2017-8-5

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https://ww2.mathworks.cn/matlabcentral/answers/351666-creating-timeseries-using-date-num

评论： Star Strider 2017-8-5

I want to create a time series of daily values, in which daily values are reported at 12times/day. Hence the series altogether should have a 4380 values. I tried this way in a first attempt:

data=datenum(2007,1,1,0,0,[0:2:24-1].'):datenum(2007,12,31,0,0,[0:2:24-1].');

However, the result is only 365 values. Any help?

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Answer 1

Star Strider 2017-8-5

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The datenum function returns days and fractions of days.

Try this:

data = datenum(2007,1,1,0,0,0) : 1/12 : datenum(2007,12,31,23,59,59); 
Check = datevec([data(1:3)'; data(end-2:end)'])                         % Check Results
Check =
        2007           1           1           0           0           0
        2007           1           1           2           0           0
        2007           1           1           4           0           0
        2007          12          31          18           0           0
        2007          12          31          20           0           0
        2007          12          31          22           0           0

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Star Strider 2017-8-5

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My code produces the result you want. The times are every 2 hours.

So for January 1st and 2nd:

Jan_1_2 = datevec(data(1:24)')
Jan_1_2 =
          2007           1           1           0           0           0
          2007           1           1           2           0           0
          2007           1           1           4           0           0
          2007           1           1           6           0           0
          2007           1           1           8           0           0
          2007           1           1          10           0           0
          2007           1           1          12           0           0
          2007           1           1          14           0           0
          2007           1           1          16           0           0
          2007           1           1          18           0           0
          2007           1           1          20           0           0
          2007           1           1          22           0           0
          2007           1           2           0           0           0
          2007           1           2           2           0           0
          2007           1           2           4           0           0
          2007           1           2           6           0           0
          2007           1           2           8           0           0
          2007           1           2          10           0           0
          2007           1           2          12           0           0
          2007           1           2          14           0           0
          2007           1           2          16           0           0
          2007           1           2          18           0           0
          2007           1           2          20           0           0
          2007           1           2          22           0           0