data = readtable('USA_SITE_004_final.txt'); %import text file and present as table
data_nan = standardizeMissing(data, -999); %return '-999' values as 'NaN'
hourly_temp_rain_sm = data_nan(:, [1 5 11 26]); %extract key variables
TT = table2timetable(hourly_temp_rain_sm); %form timetable
daily_temp_rain_sm = retime(TT, 'daily', 'mean'); %retime data to obtain daily averages
daily_sm = daily_temp_rain_sm(:,3);
Hi, i have created a timetable and retimed soil moisture data here to obtain daily averages for a period of several years. I now want to be able to obtain a metric for each year and to do this i will need to separate the data into years, keeping the daily averages each year. I hope that makes sense and thank you in advance for any help.