MATLAB: I had time 21:09 and i want to generate previous 10 time events like 21:08 to 20:59. so how to implement

MATLABplotting real time data and assign ticks of real time on x-axis

I used datenum but the difference between them is not same

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the units of datenum are in days so you need to subtract by the fraction of day.

 datestr(datenum('21:09')-1/24/60,15) %will return 21:08

 datestr(datenum('21:09')-[0:10]/24/60,15)

will generate the past 10 times

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MATLAB: Rounding Time to next half hour

This is probably more efficient than it looks:

tv = ['9/8/2015 14:28:01'; '9/8/2015 14:29:01'; '9/8/2015 14:31:01'; '9/8/2015 14:31:02'; '9/8/2015 14:31:03'];
tv_dv = datevec(datenum(tv, 'mm/dd/yyyy HH:MM:SS'));            % Generate ‘datevec’ Date Vectors
tv_rnd = datevec(datenum([tv_dv(:,1:4) [30*(tv_dv(:,5)<30) + 60*(tv_dv(:,5)>=30)] tv_dv(:,6)]));    % Rounded Date Vectors

It uses the logic of the vector ‘[30*(tv_dv(:,5)<30) + 60*(tv_dv(:,5)>=30)]’ to brute-force round all minute values less than 30 to 30, and everything greater than 30 to 60. I let the logic of the datenum function take care of conversion, and then converted them back into date vectors (so I could check the result).

Remove the datevec call in tv_rnd to keep them as date numbers, or convert them back to date strings instead in your code.

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Loadlibrary compiles all thunk files as c not c++. The header file used must be c compatible, wrap all extern "C" statements with #ifdef __cplusplus as is normally recommended for c compatible headers.

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