Ask for partitioning a matrix

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Bundit Buddhahai
Bundit Buddhahai 2014-4-19
评论： Bundit Buddhahai 2014-4-28
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
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
Andrei Bobrov 2014-4-22
编辑：Andrei Bobrov 2014-4-24
[~,~,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
Andrei Bobrov 2014-4-25
[a,~,c] = unique(abs(X(:,2)));
out = [a, accumarray(c,-sign(X(:,2)).*X(:,1))];
Bundit Buddhahai
Bundit Buddhahai 2014-4-28
Many thanks Bobrov, your method is concise but very excellent. Great!

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