First value in the cycle

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Filip Konecny
Filip Konecny 2018-2-22
编辑： Birdman 2018-2-22
Hello to all,
I have a matrix with 2 columns. In the first column there is time, in the second there is ID of the time.
So the whole matrix looks for example like this:[1 2 3 4 5 6 7 8 9 10;1 1 1 2 2 2 5 5 5 7]' ([time;ID]')
I need to make a for cycle which goes through the matrix and takes only the first time value for single time ID.
So the result looks like this: [1 4 7 10]
Thank you very much
Best regards

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Birdman
Birdman 2018-2-22
编辑：Birdman 2018-2-22
A=[1 2 3 4 5 6 7 8 9 10;1 1 1 2 2 2 5 5 5 7].';
[~,idx]=unique(A(:,2));
A(idx,1)

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