Assigning word to different colour

I have a code using k means

for k = 1:(length(dirlist))

      img = imread([pathname, dirlist(k).name]);

flatImg = double(reshape(img,size(img,1)*size(img,2),size(img,3)));
idx = kmeans(flatImg,3); 

end

I have around 20 images ,I have specified k=3,so for each colour i need to specify a word such as A,B,C

please tell how toprocess

What "word" are you referring to in your question, that is to be assigned a different color?

words aor letters such as

A for one colour

B for another colour

C for another colour

for example the output of idx will consists of 1's,2's,3's

so want to assign A for 1

B for 2

C for 3

The output of idx is not colors, it is cluster numbers.

Why do you want to do this? Why not just turn it back into an image? What are you going to do with a character array?

Answer 1

cluster_letter = char('A' + idx - 1);

i did the following

for k = 1:(length(dirlist))

        img = imread([pathname, dirlist(k).name]);

flatImg = double(reshape(img,size(img,1)*size(img,2),size(img,3)));
idx = kmeans(flatImg,3); 
N{k}=(reshape(idx,size(img,1),size(img,2)))
cluster_letter = char('A' + idx - 1)
Ncluster{k}=(reshape(cluster_letter,size(img,1),size(img,2)))
end

i get the answer, but in variable editor i get all values in same cell ,i need each letter in each cell