Error with using 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.

[KSSV]

It looks filtered.SD is a cell....what is it? What you expect?

Answer 1

[Fangjun Jiang]

>> 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'

[James]

Thank you.