Is there a one-line code for this?

% I would like to go from A = [1 1;2 2;3 3;4 4;5 5] 
%                      to A = [1 1;2 2;3 3;4 4;5 5;1 2;2 3;3 4;4 5;5 6];
A = [1 1;2 2;3 3;4 4;5 5];

% Multi-line approach
B = A;
B(:,2) = B(:,2) + 1;
A = [A;B];
clear B

% Is there a way to do this in one line of code? I have to do similar operations multiple times, 
% and would like to know if there is a way to do so. Otherwise, I will settle for a function.

% Note that the actual matrices are 1,000,000+ x 30 in size.
% Thank you

Answer 1

[Stephen23]

A = [1 1;2 2;3 3;4 4;5 5];
A = [A;A+(0:1)]

A = 10×2

1 1 2 2 3 3 4 4 5 5 1 2 2 3 3 4 4 5 5 6

[Mitsu]

Thank you, Stephen.

I suppose for a specific column column_no in a larger matrix, the simplest way is the following then?

A = [A;A+[zeros(1,column_no-1),1,zeros(1,size(A,2)-column_no)] ];

[Stephen23]

"the simplest way is the following then?"

Probably the "simplest way" is just as you show in your question.

If you want to avoid duplicated data, you could create B first then add one to the appropriate (part-)column.

[Mitsu]

Understood. Thank you.