How to get the indices based on month and year?

I have an array of data, "B", with a corresponding datetime array. The data spans between 2018-2022 but its not uniformly distanced so some months have more data than others. My plan is to loop through the data, get the data that corresponds to a month and year (ex. Jan 2020) and run some functions, and then get the data that corresponds to the next month and year, and repeat.

Is there any way I can do it more efficiently? Any functions where I can categorize the data by month and year?

[Stephen23]

https://www.mathworks.com/help/matlab/ref/timetable.retime.html

Answer 1

[Walter Roberson]

You can use timerange

But if you want to group by month, then typically it is easier to do something like take

[y, m] = ymd(DATETIMES);
G = findgroups(y, m);

Now you can use G together with splitapply

[Walter Roberson]

Also, you should check to see if using retime could be used for your situation.