Problems with my Macro

I am trying to run a function that I have written in MATLAB automatically for twenty five text files that I have. I am using the following code;

function SINANALYSIS(in,out,out2,out3)
 x = load(in); 
 y = SOME ANALYSIS ON SIN FUNCTION
y2 = FURTHER ANALSYSIS on SIN FUNCTION
y3 = PART3 ANALYSIS
 save(out,'y')
 save(out2,'y2')
 save(out3,'y3')

file 2: "process_it_all"

 in = {'file1.txt','file2.txt' 'file.txt'...'file25.txt'};
 out = {'VAR1'};
out2={'VAR2'};
out3 = {'VAR3'};
 for i = 1:numel(in)
  SINANALYSIS(in{i},out{i},out2{i}, out3{i})
 end

However, I am getting many errors using this code. Is there another way about automating this process?