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Asked: 2026-06-01T16:20:50+00:00

I want to add one value at the beginning of a matrix for example,

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I want to add one value at the beginning of a matrix for example, my matrix is

0,0,0,0,0,0
0,1,1,1,0,0
1,0,0,1,0,0
1,1,1,0,0,0

then I want to add ‘1’ or ‘0’ at the first column therefore it will become like this

1,0,0,0,0,0,0
1,0,1,1,1,0,0
1,1,0,0,1,0,0
1,1,1,1,0,0,0

0,0,0,0,0,0,0
0,0,1,1,1,0,0
0,1,0,0,1,0,0
0,1,1,1,0,0,0

how can I do that in MATLAB?

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1 Answer

  1. Editorial Team

    You can concatenate matrices without creating another one from scratch like this:

    % your matrix
A = [ 0,0,0,0,0,0;
      0,1,1,1,0,0;
      1,0,0,1,0,0;
      1,1,1,0,0,0 ];

A_with_zeros = [zeros(size(A,1),1) A]
A_with_ones = [ones(size(A,1),1) A]

% Output:
%  A_with_zeros = [ 0 0 0 0 0 0 0
%                   0 0 1 1 1 0 0
%                   0 1 0 0 1 0 0 
%                   0 1 1 1 0 0 0 ]
% 
%  A_with_ones = [ 1 0 0 0 0 0 0 0
%                  1 0 0 1 1 1 0 0
%                  1 0 1 0 0 1 0 0
%                  1 0 1 1 1 0 0 0 ]

    Documentation about concatenating matrices:

  2. horzcat
  3. vertcat

    4. These two documentation pages describe in details the existing methods that let you concatenate arrays horizontally (what I did in the example above) and vertically (if you wanted to add lines to your matrix).

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