changing the existing variables on the for loop

I want to change the r value to k value and vice versa for k value at the end of each loop. for example according to the following example, r and k are 4 6 8 10 at the end of first loop but i want k as 6 8 10 12. so after that for the second loop r will add up with 5 and k will add up with 3 and again the variables will change. how can i do this implementation?

abc=[1 3 5 7]

for t=1:3

k=abc+3

r=5+abc

r=k

k=r

end

k = 4 6 8 10

r = 6 8 10 12

r = 4 6 8 10

k = 4 6 8 10

k = 4 6 8 10

r = 6 8 10 12

r = 4 6 8 10

k = 4 6 8 10

k = 4 6 8 10

r = 6 8 10 12

r = 4 6 8 10

k = 4 6 8 10

[Awais Saeed]

It is not clear what you are trying to say.

[Kerem Yüksel]

i have a variable abc. abc goes into k=abc+3 and r=abc+5. now k is = 4 6 8 10 and r is = 6 8 10 12. after the first loop of 'for', i want make the k = 6 8 10 12 and r = 4 6 8 10. for the second loop of 'for', i want to make these mathematical operations with the new values of r and k as follows. k=abc+3 which is expected as = 9 11 13 15 and for r = abc +5, it is expected as = 11 13 15 17. how can i do that?

[Kerem Yüksel]

the change of variables at the end of each round should be done

[Stephen23]

http://web.archive.org/web/20210820130943/https://www.mathworks.com/matlabcentral/answers/1437389-changing-the-existing-variables-on-the-for-loop

Answer 1

[Stephen23]

abc = [1,3,5,7];
k = abc;
r = abc;
for ii = 1:5
    [r,k] = deal(k+3,r+5)
end

r = 1×4

4 6 8 10

k = 1×4

6 8 10 12

r = 1×4

9 11 13 15

k = 1×4

9 11 13 15

r = 1×4

12 14 16 18

k = 1×4

14 16 18 20

r = 1×4

17 19 21 23

k = 1×4

17 19 21 23

r = 1×4

20 22 24 26

k = 1×4

22 24 26 28

[Kerem Yüksel]

so how can i do these steps with the set of operations that i can not write between parantheses

[Stephen23]

@Kerem Yüksel: what "set of operations" do you want to perform?

[Kerem Yüksel]

the variables goes into another 'for' loop on this for loop, 'bitxor' and mixes according to a certain rule. the set of operations are very long to write them there and also i can not write because of similarity issues.

[Kerem Yüksel]

I will be glad if you can help me

[Kerem Yüksel]

also these operations are not all of them, if you can show me how to change variables for every loop in general with these specifications, i will be glad

[Stephen23]

@Kerem Yüksel: without more specific details or examples, it sounds like you should use one matrix and indexing.