How to store results from every loop in For-Loop

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Meshooo
Meshooo 2012-12-20
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
  1 个评论
Jonathan Epperl
Jonathan Epperl 2012-12-20
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);

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2012-12-20
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
  2 个评论
Meshooo
Meshooo 2012-12-21
编辑：Meshooo 2012-12-21
Yes, it works. Thank you very much. But I think we should use () not {}
A1(k,c) = P_Centro_1(:,1); %Intensity value
Meshooo
Meshooo 2012-12-26
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..

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