add column to matrix in matlab

To add a column to an existing matrix in Matlab, you can use indexing and concatenation. Here is an example:

main.m
% create a 3x3 matrix 
A = [1 2 3; 4 5 6; 7 8 9];

% create a new column vector 
new_col = [10; 11; 12];

% concatenate the new column vector to the existing matrix
% specify the new column as the fourth column by indexing with ':'
A = [A, new_col];
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In this example, we first create a 3x3 matrix A and a new column vector new_col. To add the new column to A, we concatenate it to A using the square bracket notation [A, new_col]. We use : to specify the new column as the fourth column in A. The resulting matrix A is now a 3x4 matrix with the new column added on the right.