Every time I run the code, value of (k) changes. why?

function [label] =  clutseringData  (Data , C)

dis = zeros(size(Data,1), size(C,1));
label = zeros(size(Data,1), 1);


        for i = 1:size(Data,1)
                   for j = 1:size(C,1)
                       dis(i, j) = norm(Data(i,:) - C(j, :));
                   end   
        end


        for k = 1:size(Data,1)
            label(k) = find( dis(k,:) == min(dis(k,:)) );
        end

end

[Ameer Hamza]

What are the values of input argument Data and C? What do you mean that value of k changes? It is a counter variable for a for-loop, therefore it will change from 1 to size(Data,1).

[Menna Omar]

I'm trying to build a kohonen algorithm so, Data is the training data of the model, its size is 300*2:

trainingData = [randn(100,2)*100+ones(100,2); randn(100,2)*0.5-ones(100,2); randn(100,2)*0.75]; 

C is the weights after making the algorithm calculation which it 4*2 matrix so I'm trying to pass those vaules to the clutseringData function

label = clutseringData  (trainingData , c);

So, k = 1:300; is equavilant to k = 1:size(Data,1)

And I mean that each time I click on run, k becomes 2 , 11, 175 or any different value and sometimes 300 in the workspace. I know it must iterate 300 time "from 1 to size(Data,1)", but its value is not 300 to make the right iteration it's dynamically changes !!

[Eva-Maria Weiss]

I'm not so sure about that, but for my understanding, for the case your program runs without error, k shouldn't be in the workspace at all, since it's not an output variable. So I would suspect, that the k that you see in you workspace could be from former tests, where you ight have set some breakpoint or something like that. I don't now---the length of label is correct?

[Menna Omar]

This is my original Mian script, the previous function I made it trying to avoid that changing in k value, then k shows in the workspace before the function creation and still changing everytime I run the code showing that error

(In an assignment  A(I) = B, the number of elements in B and I must be the same.

Error in Main (line 27)
    label(k) = find( dis(k,:) == min(dis(k,:)) );)

and I think the length of label is correct ..

clc , clear , close all;
networkWidth =4;
networkHight = 4; 
iterations = 300;
intialLearningRate = 0.1;
intialRedius = 1 ; 
plotMute = 0;

trainingData = [randn(100,2)*100+ones(100,2); randn(100,2)*0.5-ones(100,2); randn(100,2)*0.75];
trainingData = featureNormalize(trainingData);
c = som (trainingData, networkWidth, networkHight, iterations...
       , intialLearningRate,intialRedius, plotMute);

%label = clutseringData  (trainingData , c);
dis = zeros(size(trainingData,1), size(c,1));
label = zeros(size(trainingData,1), 1);

for i = 1:size(trainingData,1)
           for j = 1:size(c,1)
               dis(i, j) = norm(trainingData(i,:) - c(j, :));
           end   
end

for k = 1:size(trainingData,1)
    label(k) = find( dis(k,:) == min(dis(k,:)) );
end

[Ameer Hamza]

Menna, I guess that you are trying to find the index of the minimum value in the dis. Right? What if there are two equal minimum values.

Answer 1

[Ameer Hamza]

If you are trying to find the index of minimum value, then the following use following statement

[~,label(k)] = min(dis(k,:));

it returns the index of the minimum value in k-th row. If two minimum values are equal, then it returns the index of the first value.