How to find the transition for datetime data?

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Kasih Ditaningtyas Sari Pratiwi 2017-11-18

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https://ww2.mathworks.cn/matlabcentral/answers/367858-how-to-find-the-transition-for-datetime-data

评论： Peter Perkins 2017-11-20

Hi I have a question about how to find the transition for datetime data. I have a time series data and I want to detect the start transition and end transition. I use this following code:

changingdate = rainanalysis{:,'DatumUhrzeit'} >= 1 ;                                          
% use false as logical vector to determine transition. With function diff, 
% transitions from false (0) to true (1) will be 1 and transitions from true
% to false will be -1. This will be 1 at the start of a dry period and -1 after the end
datetransitions = diff([false; changingdate; false]);                              
datestarts = find(datetransitions == 1);
dateends = find(datetransitions == -1) -1;

However I got an error "Comparison is not defined between datetime and double arrays." I attach also the time series table and the picture contain error message here. Thank you for your help.