creating a sub date time array

I have a datetime array conisisting of dates from the 1980s till recent. it is stored in a date time array. how do i sperate the datetime array into years. for example i want a seperate array for 1980 till 1990 so on and so forth.

my data looks like this.

Answer 1

[Adam Danz]

This 2-step process is done in 1 line.

1. Round the year of the datetime vector to the decade (1999 becomes 1990s)
2. Use [G,ID] = findgroups(A) to group the datetime vector by decades.

% Create demo data
dt = (datetime(1981,12,01) : hours(4) : datetime('now'))'; 

% Assign groups to datetime vector; group by decade
[decadeGroup, decade] = findgroups(floor(year(dt)/10)*10); 

decade is a list of decades in your datetime vector.

decadeGroup are positive integers 1:n for n-decades of data.

For example to isolate the 1990s,

NinteenNinties = dt(decadeGroup==find(decade==1990));