how to subset the first column of a matrix in matlab

To subset the first column of a matrix in MATLAB, you can use the colon operator :

main.m
% Create a sample matrix
myMatrix = [1, 2, 3; 
            4, 5, 6; 
            7, 8, 9];

% Select the first column of the matrix
firstColumn = myMatrix(:, 1);
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In the above code example, we create a 3x3 matrix called myMatrix and then select the first column of the matrix using the : operator to select all rows and the column index 1. The resulting output will be a column vector containing the values [1;4;7].