Creating timeseries using date num

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?

Answer 1

[Star Strider]

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

[Star Strider]

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