# Which function should I use to find summation of specific values in a column array? I checked already histcounts function but I could not handle it.

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busra gogen on 6 May 2022
Commented: busra gogen on 6 May 2022
I need to find summation of last 10 terms in a column and continue with this interval until all the intervals are summed values in that column but my another issue is let's say I have 16 rows so last 10 rows are ok but the sum of remained 6 values are also should be calculated and the only difference btw the summation of 10 terms is their range so which functions should I check? I can do it by formulating but I am looking for a shortcut.
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busra gogen on 6 May 2022
my inputs may change so this is why I am looking for a function. My input contains years and number of occurence regarding these years. For example, it may be like this:
years #ofevents
1900 5
1901 17
1902 8
1903 9
....
1939 10
This case looks normal because there are 4 intervals but if it ends with 1940, there will be extra one year apart from 10 years intervals.

Matt J on 6 May 2022
Edited: Matt J on 6 May 2022
Let's call your matrix, A. Then,
A=rand(16,2); %hypothetical input
[N,M]=size(A);
N=ceil(N/10)*10;
A(end+1:N,:)=0;
result=sum(reshape(A,10,[]));
result=reshape(result,[],M)
result = 2×2
3.7391 5.6570 3.3933 2.2748
%Check:
sum(A(1:10,:))
ans = 1×2
3.7391 5.6570
sum(A(11:16,:))
ans = 1×2
3.3933 2.2748
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busra gogen on 6 May 2022
I changed the orientation of column, thank you so much!