combine data according to values in another vector in matlab

Question

Helene 2019-2-25

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https://ww2.mathworks.cn/matlabcentral/answers/446942-combine-data-according-to-values-in-another-vector-in-matlab

评论： Helene 2019-3-16

I have a vector t that records time points between 0 and 10 (not evenly spaced) and a vector vals that records values of some outputs at the corresponding time points. So vals is of same length as t.

t = [0 0.02 0.18 0.21 0.4 0.4 ... 9.03];

vals = [1.1 0 5.9 2.7 6 1.2... 15.3];

The underline process is periodic of period 2 and I would like to look at the outputs in one period. So I calculated tp to get the distribution of those time points in one period.

tp = sort(unique(mod(t,2)/2));

Next step is to calculate a vector vals_pd of accumulated values in one period. For example in the vector vals, both 6 and 1.2 correspond to time point 0.4 in the vector t. 0.4 corresponds to 0.2 in tp. Then in the vector vals_pd, I want 6+1.2 be at the same position as 0.2 in tp.

How can I obtain the vector vals_p? Any help would be appreciated.

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Answer 1

Bob Thompson 2019-2-25

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https://ww2.mathworks.cn/matlabcentral/answers/446942-combine-data-according-to-values-in-another-vector-in-matlab#answer_362702

I know others can probably do better than I can at this, but here goes.

data = [t; vals];
tims = uniques(t);
for i = 1:length(tims)
    data = [data(:, data(1,:) <tims(i)),[tims(i);sum(data(2,data(1,:) == tims(i)))],data(:,data(1,:)>tims(i))];
end
data = data';
data = sortrows(unique(mod(t,2)/2));