writing a function in matlab

Hi!

I wrote this file to evalute some .TXT file.

I want to write it as a function. I dont know what to write as Input and Output

   %
  clear all 
  close all
  clc
  format long
  for i=1:30
   data=[];
  fileID = fopen(['measurement_'  num2str(i) '.txt']);
  block = textscan(fileID, '%s','Delimiter','\n');
  data=[data; block];
  fclose(fileID);
  compact_data=vertcat(data{:});
  compact_data(1:29:end)=[];
  compact_data(1:28:end)=[];
  result_file=fopen(['result_probe_' num2str(i) '.txt'],'w');
  fprintf(result_file,'%s\r\n',compact_data{1:1:end});
  clear all
  end

I wish you could help to transform this in a function whre i could give the input files ond get the result_probe files

Thank you

Answer 1

[John Petersen]

You can write your function like this:

function [out] = myfunction(filenums)
%
%  
n = 0;
out = zeros(length(filenums),3);
for i=filenums
   data=[];
   fileID = fopen(['measurement_'  num2str(i) '.txt']);
   try 
       block = textscan(fileID, '%s','Delimiter','\n');
       data=[data; block];
       fclose(fileID);
       compact_data=vertcat(data{:});
       compact_data(1:29:end)=[];
       compact_data(1:28:end)=[];
   catch
   end
   try    
          result_file=fopen(['result_probe_' num2str(i) '.txt'],'w');
          fprintf(result_file,'%s\r\n',compact_data{1:1:end});
          fclose(result_file);
   catch
          n = n +1;
          out(n,:) = [i, fileID, result_file];
   end

end
end

Usage would be:

out = myfunction(1:30);

The inputs give you the option to select specific files, the output gives you an array that tells you which files were successfully opened. Any -1 in a column signifies that the corresponding file failed to open.

[Rica]

thank you very much!