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extract numbers from time series

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Johannes Deelstra
Johannes Deelstra 2018-8-13
评论： Johannes Deelstra 2018-8-13
Have a time series from 1 to 156. Want to extract the values from 1:6, then from (1+12) : (6+12), etc into a new variable. How to go about.
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Adam Danz
Adam Danz 2018-8-13
Ok. If the numbers are serial date numbers that matlab recognizes, my solution should work well. Otherwise, we'd just need to convert them to a format that Matlab recognizes which should be fairly simple.
Johannes Deelstra
Johannes Deelstra 2018-8-13
i solved the problem, thanks for your help and suggestions

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采纳的回答

Adam Danz
Adam Danz 2018-8-13
I don't know what format your dates are in but this can be adapted to any format. I assume your matrix is named 'data' and the dates are in the 5th column.
% Get the month number for each date
monthNum = month(data(:,5));
% Logical index of rows that are between May and October
monthIdx = ismember(monthNum, [5:10]);
% Extract your data for these months
data(monthIdx, :)

更多回答（1 个）

Fangjun Jiang
Fangjun Jiang 2018-8-13
a=1:156;
b=reshape(a,6,[]);
c=b(:,1:2:end)
  2 个评论
Johannes Deelstra
Johannes Deelstra 2018-8-13
see my answer to the question I got from Adam. Tried to be more specific.
Johannes Deelstra
Johannes Deelstra 2018-8-13
the dates are numbers, such as 33725 33756 33786 33817 33848 33878 33909 33939 33970 34001 34029

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