Try
>> M(:,end+1) = reshape( [1:size(M,1)], [],1 );
>> M
M =
1 3 4 9 1
3 5 5 7 2
4 6 11 7 3
0 3 7 2 4
reshape may be replace by a blip
>> M(:,end+1) = [1:size(M,1)]';
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