w = weeknum(daynums)
WEEKNUM returns vector W containing the week numbers corresponding to the dates in input vector DAYNUMS of serial date numbers.
Week 1 is the first 4-day week of the year
NB! Using Monday as first day of the week.
Quick and dirty code. No error checking. Use with caution.
Hallvard (2021). weeknum (https://www.mathworks.com/matlabcentral/fileexchange/22663-weeknum), MATLAB Central File Exchange. Retrieved .
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