why does the value of kmean color segmentation changes every time?

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hi, may i know why does the value of kmean color segmentation changes every time i run it? basically, i am using this as my function:
[FileName,PathName] = uigetfile('*.jpg','Select the MATLAB code file');
he1 = imread(FileName);
imshow(he1), title('original image');
he1= imread(FileName);
cform = makecform('srgb2lab');
lab_he = applycform(he1,cform);
figure (2)
imshow (lab_he)
ab = double(lab_he(:,:,2:3));
nrows = size(ab,1);
ncols = size(ab,2);
ab = reshape(ab,nrows*ncols,2);
nColors = 3;
% repeat the clustering 3 times to avoid local minima
[cluster_idx, cluster_center] = kmeans(ab,nColors,'distance','sqEuclidean', ...
pixel_labels = reshape(cluster_idx,nrows,ncols);
figure (3)
imshow(pixel_labels,[]), title('image labeled by cluster index');
segmented_images = cell(1,3);
rgb_label = repmat(pixel_labels,[1 1 3]);
for k = 1:nColors
color = he1;
color(rgb_label ~= k) = 0;
segmented_images{k} = color;
figure (4)
imshow(segmented_images{1}), title('objects in cluster 1');
figure (5)
imshow(segmented_images{2}), title('objects in cluster 2');
figure (6)
imshow(segmented_images{3}), title('objects in cluster 3');
a = im2bw (segmented_images{2},0.05);
figure (7)
imshow (a);
b = im2bw (segmented_images{3},0.05);
figure (8)
imshow (b);
area1 = bwarea (a);
round (area1);
area2 = bwarea (b);
round (area2);
calculate =(area1/area2);
ratio = round(calculate,2)
acc = 0.05;
result = round(ratio/acc)*acc
i want to use segmented_images{2} and segmented_images{3} as my preferred images but everytime i run it, the value of these images changes. can someone please show me a way to do this?
thank you.

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