Yes. Use a cell array. That's what it's meant for. See the FAQ for a good explanation and some good illustrative examples:

I wrote the following little function as a slightly altered version of |whos|. It lists all dimensions, and also converts the Bytes field into a human-readable format. Example in action: >> a = rand(1,2); >> b = rand(3,4,5); >> c = rand(2,3,4,5,6); >> whos Name Size Bytes Class Attributes a 1x2 16 double b 3x4x5 480 double c 5-D 5760 double >> whosh Name Size Bytes Class a 1x2 16B double b 3x4x5 480B double c 2x3x4x5x6 5K double The function: function whosh(varargin) if nargin < 1 S = evalin('base', 'whos'); else argstr = sprintf('''%s'',', varargin{:}); argstr = argstr(1:end-1); expression = ['whos(' argstr ')']; S = evalin('base', expression); end % Bytes string gig = [S.bytes] > 1024^3; meg = [S.bytes] > 1024^2 & ~gig; kil = [S.bytes] > 1024 & ~meg & ~gig; bytes = [S.bytes]'; bytes(gig) = [S(gig).bytes] ./ 1024^3; bytes(meg) = [S(meg).bytes] ./ 1024^2; bytes(kil) = [S(kil).bytes] ./ 1024; suffix = cell(size(bytes)); [suffix{:}] = deal('B'); [suffix{gig}] = deal('G'); [suffix{meg}] = deal('M'); [suffix{kil}] = deal('K'); bytestr = cellfun(@(a,b) sprintf('%d%s', a, b), num2cell(floor(bytes)), suffix, 'uni', 0); % Size string sizestr = arrayfun(@(X) sprintf('%dx', X.size), S, 'uni', 0); sizestr = cellfun(@(x) x(1:end-1), sizestr, 'uni', 0); xloc = strfind(sizestr, 'x'); xloc = cellfun(@(x) x(1), xloc); xlocmax = max(xloc); npad = num2cell(xlocmax - xloc); sizestr = cellfun(@(str,x) [repmat(' ', 1,x) str], sizestr, npad, 'uni', 0); % Format strings namecol = strvcat('Name', S.name); sizecol = strvcat('Size', sizestr{:}); bytescol = strvcat('Bytes', bytestr{:}); bytescol(2:end,:) = strjust(bytescol(2:end,:), 'right'); classcol = strvcat('Class', S.class); data = [cellstr2(namecol) cellstr2(sizecol) cellstr2(bytescol) cellstr2(classcol)]; fprintf('%s %s %s %s\n\n', data{1,:}); temp = data(2:end,:)'; fprintf('%s %s %s %s\n', temp{:});