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Spread monthly data into days

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Ajay Gupta
Ajay Gupta on 24 Sep 2021 at 21:28
Commented: Ajay Gupta on 27 Sep 2021 at 19:41
Hello,
I am new to Matlab and I am trying to spread monthly data into a table that is indexed daily. For example:
Date Data
01/1982 0.15
02/1982 -0.02
03/1982 -0.05
What I would like to achieve...
Date Data
1/1/1982 0.15
1/2/1982 0.15
1/3/1982 0.15
1/4/1982 0.15
....
1/31/1982 0.15
2/1/1982 -0.02
2/2/1982 -0.02
2/3/1982 -0.02
2/4/1982 -0.02
I other words, I am trying to convert a table with 240 rows (20 years in months) to one with 7300 rows (20 years in days).
Is this easily doable in matlab? Greatly appreciate any advice.

Accepted Answer

Kelly Kearney
Kelly Kearney on 25 Sep 2021 at 0:33
One way to do the expansion... convert your monthly dates to the first of each month, then use dateshift to check which month each of your days match:
% Some placeholder data... you'll have to read your tables as appropriate
tmon = datetime(1982, 1:3, 1);
ymon = [0.15 -0.02 -0.05];
tday = datetime(1982,1,1) + days(0:89);
% Match up days to months
[~,loc] = ismember(dateshift(tday, 'start', 'month'), tmon);
yday = ymon(loc);
  3 Comments
Ajay Gupta
Ajay Gupta on 27 Sep 2021 at 19:41
It is not external. Its an array created by my code. (241x1000 double) trying to get to 7300x1000 double.
I think I was able to resolve by adding:
yday = zeros(7300,1000);
yday(:,:) = ymon(loc,:);
Does this make sense?
Thanks again!

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More Answers (1)

Sulaymon Eshkabilov
Sulaymon Eshkabilov on 24 Sep 2021 at 21:47
You can import your data and easily convert them as you need using importdata() - see help DOC and convert date data into numbers using datenum() - see help DOC
Good luck

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