Numbering variables like that is completely the wrong approach and should be avoided.
One better approach is to use a container array, e.g. a cell array:
a{1} = [1,2,3,4,5];
b{1} = [6,7,8,9,10];
a{2} = [4,5,7,8,9];
b{2} = [3,2,4,5,7];
n = numel(a);
c = cell(1,n);
for ii = 1:n
for jj = 1:5
c{ii}(jj)=a{ii}(jj)+b{ii}(jj);
end
end
c{:}
Of course for this example the best approach would be to use numeric arrays and vectorized operations (for the given example using loops and multiple vectors is very inefficient and a very poor use of MATLAB):
a = [1,2,3,4,5;4,5,7,8,9];
b = [6,7,8,9,10;3,2,4,5,7];
c = a+b
