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

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M 2022-3-4

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https://ww2.mathworks.cn/matlabcentral/answers/1663649-how-to-use-1-column-and-all-rows-from-a-matrix-in-each-iteration

评论： M 2022-3-4

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 ..

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Answer 1

Stephen23 2022-3-4

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for k = 1:size(M,2)
    M(:,k)
end

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M 2022-3-4

Thank you so much @Stephen

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Answer 2

Arif Hoq 2022-3-4

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https://ww2.mathworks.cn/matlabcentral/answers/1663649-how-to-use-1-column-and-all-rows-from-a-matrix-in-each-iteration#answer_909804

编辑：Arif Hoq 2022-3-4

在 MATLAB Online 中打开

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

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M 2022-3-4

Thank you so much @Arif Hoq

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Answer 3

Image Analyst 2022-3-4

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https://ww2.mathworks.cn/matlabcentral/answers/1663649-how-to-use-1-column-and-all-rows-from-a-matrix-in-each-iteration#answer_909854

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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