sum in intervals from columns

Question

Annick 2020-4-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/514797-sum-in-intervals-from-columns

回答： Ameer Hamza 2020-4-2

采纳的回答： Ameer Hamza

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Hello!

I would like to have an code that tells me how much time the subject spent in a certain position (0,1,2).

Currently I have written this code, which tells me how often the value is (0,1,2) but I don't know how to write a code which does what I am looking for.

N= ActivityCode1
Sed_idx= find(N(:,1)==0);
LPA_idx= find(N(:,1)==1);
MVPA_idx= find(N(:,1)==2)

Could you please help me?

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Answer 1

Ameer Hamza 2020-4-2

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https://ww2.mathworks.cn/matlabcentral/answers/514797-sum-in-intervals-from-columns#answer_423536

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This code add the intervals corresponding to activities 0,1, and 2. The final matrix is 3x1

t = readtable('Table1.txt');
t(end,:) = []; % last line is invalid
intervals = t.Interval;
activity = t.ActivityCode1;
result = accumarray(activity+1, intervals);