fid = fopen('Matrix.txt', 'wt');
fprintf(fid, [repmat('%g\t', 1, size(M,2)-1) '%g\n'], M.');
fclose(fid)
There is a different approach:
fid = fopen('Matrix.txt', 'wt');
fwrite(fid, '%s', evalc('disp(M)'));
fclose(fid)
This will literally output whatever Matlab would, including things like writing a vector in a cell array out as (e.g.) [2 x 3 double]
