Creation timeSeries using a datetime variable

Question

Cedric Mariage 2015-8-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/233113-creation-timeseries-using-a-datetime-variable

编辑： per isakson 2015-8-15

采纳的回答： Adam Barber

在 MATLAB Online 中打开

Hi- I'm new to matlab world and I do have some issue dealing with the timeseries

I have two arrays

One time array(name time) which is a string cell array like this "dd-MM-yyy HH:mm:SS"
One array which represents my value for each time

I found a solution but it’s quite slow

% transformed my time array in datetime
Time2 = datetime(time,'InputFormat','dd-MM-yyyy HH:mm:SS')
%transforme my datetime array in date string
Time3= datestr(Time2)
%Create the timeseries
Ts = timeseries ( data,Time3)

This code is working but it's very slow is that possible to improve this?

Thanks in advance

Regards,

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Answer 1

Adam Barber 2015-8-12

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Hi Cedric,

If you already have your dates in a cell array string format, you should not need to convert to datetime in order to create a timeseries. For example, see the code below

%%Generate 100 random dates with a specified string format
datenumbers = rand(100,1)*now;
datenumbers = sort(datenumbers); % put them in increasing order
dateStrings = datestr(datenumbers, 'dd-mm-yyyy HH:MM:SS');
%%At this point "dateStrings" should be just like the data you have
Ts = timeseries(data, dateStrings);

Currently you cannot create a timeseries with "datetimes", but using a date string should work. If this is still slow for you, you may want to post either your data and full code or the results of running the profiler on the code (hit the "Run and Time" button).

Hope that helps,

-Adam