How to modify array in modifying subarray reference ?

Hello,

I would like to be able to modify an array in modifying a subarray. For example, I have these 3 arrays :

a = [1; 2];
b = [3 5; 4 6];
c = [a b];

When I modify a column of b,

b(:,1) = [6 8];

I would like that c changes too and becomes : [1 6 5; 2 8 6]. Whereas currently c remains [1 3 5; 2 4 6]...

How can I do that ?

Answer 1

[Ameer Hamza]

There is no easy way to do such a thing in MATLAB. The closest you can get is to define your own class and add event listeners to react whenever there is a change in the value of b. That will require a fair share of understanding of MATLAB OOP. Read Siddharth's answer here: https://www.mathworks.com/matlabcentral/answers/808-how-to-react-on-a-change-of-variable-from-workspace to get a general idea. Also, read the following resources

https://www.mathworks.com/help/matlab/matlab_oop/events-and-listeners.html

https://www.mathworks.com/help/matlab/matlab_oop/listening-for-changes-to-property-values.html

https://www.mathworks.com/help/matlab/matlab_oop/learning-to-use-events-and-listeners.html

[Clément T]

Thank you for your answer. I'll go check it out

Answer 2

[Saurav Roy]

Hi....

I am not sure I understood your question properly but I wrote something as per my initial understanding to get your results.

a = [1; 2];

b = [3 5; 4 6];

b(:,1) = [6 8];

c = [a b];

disp(c);

[Clément T]

Thank you for your answer.

After I create a and b, I'll define c as :

c = [a b]

I was asking if there is a way to change the second column of c without doing :

c(:,2) = [6 8]

but in doing :

b(:,1) = [6 8]

In other words, is Matlab able to understand that b is in c ? And so if modifying b modifies c ?