How to get yearly sum values

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davit petraasya
davit petraasya on 20 May 2016
Commented: Ice lady on 21 Aug 2016
Hi
I Have time variables, such as [01/04/1960(dd/mm/yyyy),23/09/1960, 08/01/1980, 18/11/1980] and corresponding magnitude values[5, 4.2, 6, 7]. I need yearly sum values of magnitudes. So for the year 1960 I am supposed to get 9.2, and for 1980 the value 13.(Actually my table is much bigger, I just gave 2 years values to know the way how to do it).
So how I can get yearly sum values?
Thank a lot!

Accepted Answer

Azzi Abdelmalek
Azzi Abdelmalek on 20 May 2016
d={'01/04/1960';'23/09/1960';'08/01/1980';'18/11/1980'}
v=[5; 4.2; 6;7]
a=datevec(d,'dd/mm/yyyy')
[y,~,kk]=unique(a(:,1))
out=[y accumarray(kk,v)]
  7 Comments
davit petraasya
davit petraasya on 20 May 2016
Thank you Azzi for answering to this question also. You are very helpful.
Ice lady
Ice lady on 21 Aug 2016
Dear Azzi,
I have a similar problem to davit and tried to re-write the above to work for me, but failed. My date data is in form YYYY = A(:,1), mm = A(:,2) and dd = A(:,3). My daily data has variable number of entries and is in column A(:,5). I also need to compute annual data totals.
Any suggestions would be greatly appreciated.
Thanks in advance

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