repeating same procedure for two data sets by cell or struct array?

I'm struggling to find a way to efficiently repeat the same procedure for two separate data sets. I thought it is something to do with struct or cell arrays, but no idea how to do it. I would truly appreciate your help!

 % both data are m by n matrix containing returns of stock prices 
 rtn1=data1;
 rtn2=data2;
% % want to avoid repetition by indexing the data names
% I know it is wrong, but the image of what I would like to do is...
 for j=1:2
    % operation is done only for the first column of the data
    firstRtn=rtn(j)(:,1);
    % calculate 1 year average
    rollingAve=zeros(length(firstRtn)-251,1);
     for i=1:length(rtn(j))-251
         rollingAve(i)=average(rtn(j)(i:i+251));
     end
     figure
     plot(rollingAve)
 end

Answer 1

[Walter Roberson]

rtn = {data1; data2};
for j = 1 : length(rtn)
  rollingAve = movavg( rtj{j}, 'simple', 251);
  figure
  plot(rollingAve)
end

http://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

[yp78]

Thank you Walter, I got the idea of how to use the cell. But when I run the code(after modifying the typo), I have the following error message. "Operands to the and && operators must be convertible to logical scalar values." It seems to be related to the movavg function. But actually, I have to use similar operations for other statistics (some of them user defined functions) other than the moving average. Could you show me how I can access to the (i:i+251) elements in the cell array, looking at my first code posted?