# Spread monthly data into days

조회 수: 17 (최근 30일)
Ajay Gupta 2021년 9월 24일
댓글: Ajay Gupta 2021년 9월 27일
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.

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### 채택된 답변

Kelly Kearney 2021년 9월 25일
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);
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Kelly Kearney 2021년 9월 27일
Can you clarify how your data is stored? Is it in an external file?
Ajay Gupta 2021년 9월 27일
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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### 추가 답변 (1개)

Sulaymon Eshkabilov 2021년 9월 24일
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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Ajay Gupta 2021년 9월 26일
Thanks!

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