Average length of lines obtained through hough transform

Hello Everyone,

I am new to matlab and this is my first post. I need some guidance.

I have two images and I can extract lines from these images. Image A has many short lines and Image B has fewer yet longer lines and for me the image with longer lines is better.

but how can I show it quantitatively or let's put it this way: how can I show that the average length of all the lines in image B is greater than the average length of lines in image A. I am using the following code:

RGB  = imread('a.tif');
I = rgb2gray(RGB);
rotI = imrotate(I,33,'crop');
BW = edge(rotI,'canny');
[H,T,R] = hough(BW);
imshow(H,[],'XData',T,'YData',R,...
            'InitialMagnification','fit');
xlabel('\theta'), ylabel('\rho');
axis on, axis normal, hold on;
P  = houghpeaks(H,50,'threshold',ceil(0.3*max(H(:))));
x = T(P(:,2)); y = R(P(:,1));
plot(x,y,'s','color','white');
% Find lines and plot them
lines = houghlines(BW,T,R,P,'FillGap',60,'MinLength',40);
figure, imshow(rotI), hold on
max_len = 0;
for k = 1:length(lines)
   xy = [lines(k).point1; lines(k).point2];
   plot(xy(:,1),xy(:,2),'LineWidth',2,'Color','green');
    % Plot beginnings and ends of lines
   plot(xy(1,1),xy(1,2),'x','LineWidth',2,'Color','yellow');
   plot(xy(2,1),xy(2,2),'x','LineWidth',2,'Color','red');
 % Determine the endpoints of the longest line segment
  len = norm(lines(k).point1 - lines(k).point2);
 if ( len > max_len)
      max_len = len;
  xy_long = xy;
end
end
plot(xy_long(:,1),xy_long(:,2),'LineWidth',2,'Color','blue');

Let me know if I need to upload the images. Thanks