generate column array with day in year number for each hour in a year

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Mayk
Mayk on 22 Oct 2021
Answered: Mayk on 22 Oct 2021
Dear,
i want a column array with length equal to hours in a year: 365d*24h = 8760
the content of the array should be the number of the day, corresponding with the hours, so:
1,1,1,1,1,..1,2,2...,2,3,3,...,3... - 365,365,...,365. (total length: 8760 values, number 1 should be repeated 24 times, then number 2 repeated 24 times, etc).
How to code this efficiently?
What i tried was a for-loop, but i want to use a more efficient way:
days = zeros(24,1);
all_days = days;
for i = 1:365-1
all_days = [all_days; days+i];
end

Accepted Answer

KSSV
KSSV on 22 Oct 2021
r=repmat(0:364,24,1) ;
r=r(:);
  1 Comment
Mayk
Mayk on 22 Oct 2021
wow genius! i did know repmat, but i didn't know that using r=r(:); puts everything in one column!
r = r(:); % this converts matrix into a one column array

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More Answers (1)

Mayk
Mayk on 22 Oct 2021
using this improvement, my time to run this section of code decrease from:
Elapsed time is 0.002214 seconds.
to
Elapsed time is 0.000130 seconds.
thanks!
measured by puting 'tic' before code and 'toc' at end of code to measure time to run code.

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