get eccentricity and metric values images

bro, I want to save the eccentricity and metric values of many images so that they form a table of eccentricity values and a metric of multiple images.

How do i make a loop?

source code:

clear; clc; close all;

%mfolder='E:\Kuliah\TesMatlalb\tesLATIH';
%filenames = dir(fullfile(mfolder, '*.png'));
%total = numel(filenames);
i = imread('21.png'); 
im = im2bw(i,.25);
bw = imcomplement(im);
bw = imfill(bw,'holes');
bw = bwareaopen(bw,50);
%figure,imshow(bw);

[bw,num] = bwlabel(bw);
bbox = zeros(num,4);
RGB4 = i;
  
for k = 1:num
    bw2 = bw==k;
    [B,L] = bwboundaries(bw2,'noholes');
    stats = regionprops(L,'All');
    perimeter = cat(1,stats.Perimeter);
    area = cat(1,stats.Area);
    eccentricity = cat(1,stats.Eccentricity);
    metric = 4*pi*area/perimeter^2;
    bbox(k,:) = cat(1,stats.BoundingBox);
end
  
RGB5 = insertShape(i, 'Rectangle', bbox, 'LineWidth', 1);
figure, imshow(RGB5);

Answer 1

[Image Analyst]

Index your variables with k:

    area(k) = cat(1,stats.Area);
    eccentricity(k) = cat(1,stats.Eccentricity);
    metric(k) = 4*pi*area/perimeter^2;

[riki anohq]

Thanks, i use this

 metric(1,k) = 4*pi*area/perimeter^2;