# How to divide the data of a matrix?

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Abin Krishnan on 13 Feb 2014
Answered: Jos (10584) on 13 Feb 2014
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 on 13 Feb 2014
You can give a short numeric example to explain what you want

Jos (10584) on 13 Feb 2014
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)

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