Move and swap elements between vectors using loops and functions?

2017 12 5
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lets say there are four vectors each has different dimension as follow: A=[5 7 11 15 17], B=[4 14 19 21], C=[2 6 9 10 13 18], D=[3 8 12 16 20]
First, I wan to remove elements of A to B one by one(each time one element should be moved) vice versa from B to A, and the same for C and D. Secondly, I want to swap elements of A with B ( also each time just one swap), and the same for C and D.
How can I do both steps move and swap using loops and functions?

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Jan
Jan 2017-12-6
编辑：Jan 2017-12-6
This sounds like a homework question. Then please mention, if it is one, because this demands for another kind of answering. Post, what you have tried so far and ask a specific question. It would not be useful, if the forum solves your homework.
What does "remove elements of A to B" mean? What should be removed? A and B do not have common elements.
How can you swap elements of A and B one by one, if they have a different number of elements?
If this is really a homework, let me mention, that this is the most useless problem I've ever seen. I cannot imagine, what you should learn from programming this strange process.
Hajem Daham
Hajem Daham 2017-12-6
Hi Jan, This is not a homework, in fact it is a real problem, so if you can help please do it, otherwise let's see if somebody can help. I know it is difficult, for this reason I ask, also I know that it is not easy to make a loop or function to move or remove elements and to swap, but I hope someone who is expert can help.
Jan
Jan 2017-12-6
@Hajem: Okay, no homework. Then please answer my questions for clarifications. What does "remove elements from A to B" mean? Create the wanted output manually for the posted example data. The same for "swap elements". The terms are neither unique nor clear.
Hajem Daham
Hajem Daham 2017-12-6
@jan, what I mean by remove elements one each time is to make a loop or function to do it dynamically, for example, start by the first element of A which is 5 and remove it to B, so B=[5 4 14 19 21], and then the second element of A which is 7 and remove it to B, so B this time is =[7 4 14 19 21] and repeat for all elements of A to B and the same thing from B to A.
For swapping, is to replace the elements of A with B, for example in the first swap, we replace the first element of A with the first element of B so A=[4 7 11 15 17] and B become B=[5 14 19 21] and then the same for all elements of A and B. The same thing should be done for C and D. I hope this clear for you.

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Jos (10584)
Jos (10584) 2017-12-6

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Vague question → vague answer:
% swap at position k
k = 3
c = A(k)
A(k) = B(k)
B(k) = c

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Hajem Daham
Hajem Daham 2017-12-6
Thank you, Jos, but this replaces just one element of each vector. What I need is replace(swap) all elements dynamically using loop or function.

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