How to store results from every loop in For-Loop

Hello everyone; I want to load the whole 21 intensity images (Intensity) from the folder and find their intensity value in 6 points which I already know them.

I wrote the following program which works very well but I want to use a for loop because the number of points is not always 6.

Could you please check this code to make a for loop

   for k = 1:(numel(filelist)); 
        Intensity = imread(filelist(k).name);

        P_Centro_1 = []; %1st centroid
        P_Centro_1 = impixel(Intensity,(center(1,1)),(center(1,2)));
        P_Centro_1 = P_Centro_1(:,1); %Intensity value
        A1(:,k)= P_Centro_1;

        P_Centro_2 = []; %2nd centroid
        P_Centro_2 = impixel(Intensity,(center(2,1)),(center(2,2)));
        P_Centro_2 = P_Centro_2(:,1);
        A2(:,k)= P_Centro_2;

        P_Centro_3 = []; %3rd centroid
        P_Centro_3 = impixel(Intensity,(center(3,1)),(center(3,2)));
        P_Centro_3 = P_Centro_3(:,1);
        A3(:,k)= P_Centro_3;

        P_Centro_4 = []; %4th centroid
        P_Centro_4 = impixel(Intensity,(center(4,1)),(center(4,2)));
        P_Centro_4 = P_Centro_4(:,1);
        A4(:,k)= P_Centro_4;

        P_Centro_5 = []; %5th centroid
        P_Centro_5 = impixel(Intensity,(center(5,1)),(center(5,2)));
        P_Centro_5 = P_Centro_5(:,1);
        A5(:,k)= P_Centro_5;

        P_Centro_6 = []; %6th centroid
        P_Centro_6 = impixel(Intensity,(center(6,1)),(center(6,2)));
        P_Centro_6 = P_Centro_6(:,1);
        A6(:,k)= P_Centro_6;

    end

    hold on
    plot(A1,'b-')
    plot(A2,'c-')
    plot(A3,'g-')
    plot(A4,'y-')
    plot(A5,'r-')
    plot(A6,'m-')
    hold off

So the following could be the answer but how to store the results from every for loop before going to the 2nd loop?

for k = 1:21
    Intensity = imread(filelist(k).name);
    for c = 1:6
        P_Centro_1 = []; % list of centroids
        P_Centro_1 = impixel(Intensity,(center(c,1)),(center(c,2)));
        P_Centro_1 = P_Centro_1(:,1); %Intensity value
        A1(:,k)= P_Centro_1;
    end
end

[Jonathan Epperl]

You will probably want to use a cell array, whose elements can be pretty much everything:

C = cell(2,3);
C{1,1} = 'string';
C{1,2} = 3.1415;
C{2,1} = zeros(10,10);
C{2,3} = eye(3);

Answer 1

[Azzi Abdelmalek]

for k = 1:21
  Intensity = imread(filelist(k).name);
  for c = 1:6
       P_Centro_1 = impixel(Intensity,(center(c,1)),(center(c,2)));
       A1{k,c} = P_Centro_1(:,1); %Intensity value
  end
end

[Meshooo]

Yes, it works. Thank you very much. But I think we should use () not {}

A1(k,c) = P_Centro_1(:,1); %Intensity value

[Meshooo]

Hi Azziz,

I am still having small programming problem which I also post it as a question to every one.

From my previous problem, I will have an array 'A1' that has 21 rows and 6 columns. I want to find the Extended-maxima of each column using the matlab imextendedmax function.

I don't know what is wrong with my code!

for x = 1:6
A1_Colm = imextendedmax(A1(:,x), 1) %Extended-maxima with 1  H-maxima transform

M (21,6) = A1_Colm1; % to save the results from each loop in a new array M

end

The following error appears Subscripted assignment dimension mismatch.

Do you have any idea!

Thank you for your time..