generation of vector using for loop

Question

muthu kumar 2012-2-15

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/29142-generation-of-vector-using-for-loop

关闭： MATLAB Answer Bot 2021-8-20

hai friends i want to convert each image as column vector and store each column vector in a matrix an form a big matrix ex each image is of the size of 80X80 .i dont know how to store these column vector in a matrix . anybody know means plz help me thanks

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files = dir('*.tif');

num_files = numel(files);%length also used

images = cell(1, num_files);

for k = 1:num_files

images{k} = imread(files(k).name);

f=images{k};

t=size(f);

%disp(t); a=zeros(t(1)*t(2),1);

k=1;

for i=1:t(1)

    for j=1:t(2)
        a(k)=f(j,i);
       %disp(b(j,i));
        k=k+1;
    end
end
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in this i want a1(k),a2(k)....or a(k) should be a matrix and i have to add each coloumn vector to that matrix . thanks

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Answer 1

Andrei Bobrov 2012-2-15

0
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https://ww2.mathworks.cn/matlabcentral/answers/29142-generation-of-vector-using-for-loop#answer_37481

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try this is:

files = dir('*.tif');
num_files = numel(files);%length also used
images = arrayfun(@(k)imread(files(k).name),1:num_files,'un',0);
a1 = cellfun(@(x)x(:),images,'un',0);
a = [a1{:}];