MATLAB: Extracting particular row and column

MATLABrow

I have a matrix like this
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
5 6 7 8
5 6 7 8
5 6 7 8
5 6 7 8
9 10 11 12
9 10 11 12
9 10 11 12
9 10 11 12
like that so many rows.I want to extract every 4 row and 4 column continuously for whole row and save it in excel file.For a single row it works b=a(1:1:4),:);but for all row how can it possible.

Best Answer

Do you mean?
b = a(1:4:end, :)
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