Is there a one-line code for this?

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Mitsu
Mitsu 2021-6-27
评论： Mitsu 2021-6-27
% 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

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Stephen23
Stephen23 2021-6-27
Ran in:
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
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Stephen23
Stephen23 2021-6-27
"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.

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