How to divide the data of a matrix?

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Abin Krishnan 2014-2-13

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回答： Jos (10584) 2014-2-13

I have a data in which the first column gives the time and the second column gives the velocity. The time varies from 0 to 0.8 seconds.I want to divide the time into groups starting from 0 to 0.1 s, 0.1 to 0.2 ..., 0.7 to 0.8 s.Then take the count of the velocity in the respective group.

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Azzi Abdelmalek 2014-2-13

Then take the count of the velocity in the respective group What does that mean?

Azzi Abdelmalek 2014-2-13

You can give a short numeric example to explain what you want

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Answer 1

Jos (10584) 2014-2-13

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TIMES = DATA(:,1) ;
VELS  = DATA(:,2) ;
TakeTheCountOfTheVelocityFunction = @(V) numel(V) ; % or whatever you mean by this?
[n, GroupIDX] = histc(TIMES,0:0.1:0.8) ; % GroupIDX specifies the group
Result = accummarray(GroupIDX(:), VEL(:), TakeTheCountOfTheVelocityFunction)