MATLAB: Mean of data set

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how can i find mean to training data set code in matlab?

Um, how about mean() or mean2()? If not, why not?

In MATLAB, the index starts from 1. So the first line should be

C{1} = [];

The variable should also be defined before its use. So you need to specify define

N = 10;
C{2} = 1:N;