MATLAB: How can i use parallel i/o??? help me plz

Question

my code

 path_directory='C:\Users\KimJS\Desktop';
 boximg=[path_directory '/3.jpg'];
 fnames=dir('C:\Users\KimJS\Desktop\surf');
 boxImage = imread(boximg);
 boxImage = rgb2gray(boxImage);
 boxPoints = detectSURFFeatures(boxImage);
 [boxFeatures, boxPoints] = extractFeatures(boxImage, boxPoints);
 dlmwrite('box_txt.txt',boxFeatures);
 box_txt = dlmread('box_txt.txt');
 for j = 1:length(fnames)
    [pathstr,name,ext] = fileparts(fnames(j).name);
    if (strcmpi(ext,'.txt'))      
        scene = strcat('C:\Users\KimJS\Desktop\surf\',name,'.txt')
        scene_txt = dlmread(scene);
        boxPairs = matchFeatures(box_txt,scene_txt);
        if(length(boxPairs)>80)
            fprintf(" anser %s \n", fnames(j).name)
            break
        end 
    end
end

Perform dlread on array text. Read and compare different files for each loop. can i more faster i/o/??

Answer 1

 path_directory='C:\Users\KimJS\Desktop';
 boximg=[path_directory '/3.jpg'];
 fnames=dir('C:\Users\KimJS\Desktop\surf');
 boxImage = imread(boximg);
 boxImage = rgb2gray(boxImage);
 boxPoints = detectSURFFeatures(boxImage);
 [boxFeatures, boxPoints] = extractFeatures(boxImage, boxPoints);
 dlmwrite('box_txt.txt',boxFeatures);
 box_txt = dlmread('box_txt.txt');
 num_names = length(fnames);
 outputs = cell(1, num_names)
 parfor j = 1 : num_names
    [pathstr,name,ext] = fileparts(fnames(j).name);
    if (strcmpi(ext,'.txt'))      
        scene = strcat('C:\Users\KimJS\Desktop\surf\',name,'.txt')
        scene_txt = dlmread(scene);
        boxPairs = matchFeatures(box_txt,scene_txt);
        if(length(boxPairs)>80)
          outputs{j} = fnames(j).name;
        else
          outputs{j} = [];
        end
    else
      outputs{j} = [];
    end
 end
 num_outputs = 0;
 for j = 1 : num_names
   if ~isempty(outputs{j})
     fprintf(' anser %s \n', outputs{j});
     num_outputs = num_outputs + 1;
   end
 end
 if num_outputs == 0
    fprintf('No anser\n');
 end