MATLAB: Error with using sprintf

sprintf

% Write output to text file
fn = sprintf('%s_%s_.txt',filtered.SD,out.mys);
fid = fopen('.txt','wt');
fprintf('%.0f\n',n,x);
fclose(fid);
Error using sprintf
Function is not defined for 'cell' inputs.
Error in tSes (line 39)
fn = sprintf('$s_%s_.txt',filtered.SD,out.mys); 
>>
I am getting the above error message using sprintf. What is wrong with the code? Any help is appreciated.

Best Answer

>> a={'abc'}
a =
  1×1 cell array
    {'abc'}
>> sprintf('%s',a)
Error using sprintf
Function is not defined for 'cell' inputs. 
>> sprintf('%s',a{1})
ans =
    'abc'
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