How to store values in a array from a loop?

Question

Agustin 2017-4-13

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/335278-how-to-store-values-in-a-array-from-a-loop

评论： Agustin 2017-4-14

Hi; I have the following code:

Y = imread('img14g.tif');
X = imread('img14bl.tif');
Samples_Y = Y(1:20:512, 1:20:768);
Samples_X = X(1:20:512, 1:20:768);
N = size(Samples_X,1) * size(Samples_X,2);   % Number of pixels
Z = zeros(N,7);
for i = 2:25
  for j = 2:38
    for m = 1:N
      Z(m,:)=[Samples_X(i,  j),  Samples_X(i,  j+1),Samples_X(i,j-1), ...
              Samples_X(i-1,j+1),Samples_X(i+1,j+1),Samples_X(i-1,j-1),Samples_X(i+1,j-1)];
    end
  end
end

I need to store the set of pixels in Z but it only stores the last set of pixels for (25,38) on each row of Z. Can somebody help me with this?

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Answer 1

dpb 2017-4-13

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/335278-how-to-store-values-in-a-array-from-a-loop#answer_262972

在 MATLAB Online 中打开

...
m=0;
for i = 2:25
  for j = 2:38
    m=m+1;
    Z(m,:)=[Samples_X(i,  j),  Samples_X(i,  j+1),Samples_X(i,j-1), ...
            Samples_X(i-1,j+1),Samples_X(i+1,j+1),Samples_X(i-1,j-1),Samples_X(i+1,j-1)];
  end
end