How to store values in a array from a loop?

3 次查看（过去 30 天）
Agustin
Agustin 2017-4-13
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?

请先登录，再回答此问题。

采纳的回答

dpb
dpb 2017-4-13
...
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
Your loop is storing the same value in all rows every pass thru.
NB: length(2:25)=24 and length(2:38)=37 whereas N=26*39 so your end array is smaller than N by 888 vis a vis 1014 for whatever that matters.

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Matrices and Arrays 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by