# How to use 1 column and all rows from a matrix in each iteration?

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M on 4 Mar 2022
Commented: M on 4 Mar 2022
How to use 1 column and all rows from a matrix in each iteration?
For an example there is a matrix 'M' and its size 7*127 , I want to use in the first iteration the first column and all rows , in the second iteration , I want to use the 2nd column and all rows and so on ..

Stephen23 on 4 Mar 2022
for k = 1:size(M,2)
M(:,k)
end
M on 4 Mar 2022
Thank you so much @Stephen

Arif Hoq on 4 Mar 2022
Edited: Arif Hoq on 4 Mar 2022
A=randi(100,7,127); % genrating random matrix
C=cell(1,size(A,2));
for i=1:size(A,2)
C{i}=A(:,i);% in each iteration all rows and single column
end
output=[C{:}]
output = 7×127
23 23 1 25 24 50 5 6 4 59 37 3 42 91 34 89 3 29 68 82 57 17 53 99 49 14 24 20 45 7 16 95 58 57 3 13 57 92 94 32 13 54 48 9 55 42 46 6 91 41 12 75 45 20 68 24 63 33 5 74 27 13 59 86 94 6 25 66 65 60 18 38 70 51 30 25 88 50 12 98 31 55 1 28 62 36 32 88 14 59 19 51 47 37 82 83 69 11 18 23 60 12 74 12 38 20 44 43 53 22 43 15 56 93 52 15 45 44 5 22 81 33 45 42 78 60 87 46 66 97 71 61 79 58 11 10 83 38 51 35 32 60 23 6 98 59 42 69 6 31 63 72 55 18 66 2 38 77 64 11 30 50 76 33 40 35 59 59 56 36 3 23 41 38 57 100 26 11 14 68 34 92 91 34 23 46 40 35 50 35 3 11 71 64 34 15 93 99 91 65 59 98 80 10 64 94 11 53 60 4
M on 4 Mar 2022
Thank you so much @Arif Hoq

Image Analyst on 4 Mar 2022
No need to complicate things with cell arrays. Simply extract the column into a column vector that you can then use in whatever computations follow, like for example
for col = 1 : size(M, 2)
% Extract a single column into a new column vector variable.
thisColumn = M(:, col);
% Now use that variable somehow, like in a custom function
% ProcessSingleColumn() that you write.
% Save results into another array called someValue.
someValue(col) = ProcessSingleColumn(thisColumn);
end
M on 4 Mar 2022
@Image Analyst Thank you