summing columns based on certain interval
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hi
I need your help with summing columns based on certain interval
I could not find a solution already discussed. I have a matrix of size 153×10
I need to split the sum in 3 parts
the first part is the first 51 lines
the second is from line 53 to 102
the third sum is from line 104 to 153
thank you in advance
采纳的回答
The best answer will depend on what specifically you want the output to be, and also how generalizable the solution needs to be. So, for example ...
% Create some pretend input
rng default
M = rand(153,10);
% The output
sumM(1,:) = sum(M(1:51,:));
sumM(2,:) = sum(M(53:102,:));
sumM(3,:) = sum(M(104:153,:));
disp(sumM)
This does what you ask. But I expect it is not everything you want. But maybe? Give us more details.
更多回答（1 个）
Torsten
2021-5-24
0 个投票
sum(sum(A(1:51,:)))
sum(sum(A(53:102,:)))
sum(sum(A(104:153,:)))
3 个评论
umberto kober
2021-5-24
the cyclist
2021-5-24
FYI, in R2018b or later, one could instead do
sum(A(1:51,:),'all')
and so on, rather than applying the sum() twice.
umberto kober
2021-5-24
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