MATLAB: Does anyone know how to allocate a vector with datetime elements

allocationclassdatetimeMATLAB

I tried at the biginning allocating zeros vector, but it is not allowed to write on them datetime while the loop is executing. I tried allocating empty cells but still seems not to work.

Thanks in advance.

Best Answer

This question has appeared before, but there are two options I didn't see in that thread. One is to allocate an array of "Not-a-Time" elements with NaT:

d = NaT(1, 100);

Another is to do something like:

d(100) = datetime; % or NaT, or any datetime you want

which effectively does the same thing.

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MATLAB: Pre-Allocate structure with String / Datetime fields slows code down considerably

You are not using struct array. You are putting newdate (which is a datetime array) and full (which is a string array) into a struct strarray (see code difference below). In this case, I wonder if you just use newdate=NaT(2e6,1) and full=strings(2e6,1) directly would be faster. After all, combine these two big array into one struct won't help at all.

You can try struct array following the below pattern to see if it helps. I doubt it.

s1.newdate=NaT(20,1);
s1.newdate(1)
s1.newdate(20)
s2(20).newdate=NaT;
s2(1).newdate
s2(20).newdate

MATLAB: How to convert numbers in the form yyyymm to dates in the form mm/dd/yyyy

Try this:

numerical_dates = 192604 : 192609;
dates = datetime(fix(numerical_dates/100),rem(numerical_dates,100), ones(size(numerical_dates)), 'Format','MM/dd/yyyy');

Best Answer

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