First lets define some trial data:
>> M = [0,1;2,3;NaN,NaN;4,5;6,7;NaN,NaN;8,9]
M =
0 1
2 3
NaN NaN
4 5
6 7
NaN NaN
8 9
>> idx = all(isnan(M),2);
>> idy = 1+cumsum(idx);
>> idz = 1:size(M,1);
>> C = accumarray(idy(~idx),idz(~idx),[],@(r){M(r,:)});
>> C{:}
ans =
0 1
2 3
ans =
4 5
6 7
ans =
8 9
>> idr = diff(find([1;diff(idx);1]));
>> D = mat2cell(M,idr(:),size(M,2));
>> D{1:2:end}
ans =
0 1
2 3
ans =
4 5
6 7
ans =
8 9
>> C{2}
ans =
4 5
6 7
Warning: Whatever you do, do NOT try to create lots of arrays in the workspace. This will be slow, buggy, obfuscated, and makes working with the data difficult:
