can you explain the logic for this program

[jpegFiles,pathname,FilterIndex]=uigetfile({'*.png'},'Select sequence of images','MultiSelect','on');
N=length(jpegFiles);
imageArray=cell(1,N);
grayimage = cell(1,N);
filtArray=cell(1,N);
sizeimage=cell(1,N);
im1=cell(1,N);
for i = 1:N
    imageArray{i} = imread((fullfile(pathname,jpegFiles{i})));
    figure(1);
    subplot(4,3,i); 
    imshow(imageArray{i});  % Display image.  
    str=sprintf('original image %d',i);
    title(str);
end
for j=1:N
     grayimage{j} =rgb2gray(imageArray{j}); 
     figure(2);
     subplot(4,3,j);
     imshow(grayimage{j});  % Display image.  
     str=sprintf('grayimage %d',j);
     title(str);
  end

Answer 1

[Walter Roberson]

It asks the user to select some images. It reads the images and displays them in color in one figure. It then goes back over the images and makes a grayscale version of each and displays the grayscale version in a second figure.