Ask for partitioning a matrix
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Hi, I have an input matrix of 2 columns data, the first column is time index data and the second one is data which represent the status of that number (which says, if the number is positive, the number label is ‘On’ whereas when the number is negative, the number label is ‘Off’). The process of ‘On’ (positive)/ ’Off’ (negative) for each number is time sequential data (data in the 2nd column) in which the frequency for ‘On’/ ‘Off’ state for each number is arbitrary. The ‘Off’ state for each number is the one which is the closest in time index to positive value of the same number.
Thank you. Bundit
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/161277/image.jpeg)
I would like to make partitions of the input matrix to get positive/negative value that represent ‘On’/’Off’ state of each existing number in the matrix. The example is shown in the attached image
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Andrei Bobrov
2014년 4월 22일
편집: Andrei Bobrov
2014년 4월 24일
[~,~,c] = unique(abs(X(:,2)));
out = accumarray(c,(1:numel(c))',[],@(x){X(x,:)});
add
[a,~,c] = unique(abs(X(:,2)));
out = [a, accumarray(c,-sign(X(:,2)).*X(:,1))];
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Andrei Bobrov
2014년 4월 25일
[a,~,c] = unique(abs(X(:,2)));
out = [a, accumarray(c,-sign(X(:,2)).*X(:,1))];
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