How do i insert one value from one array to another array

I have 2 arrays with coordinates. For example

A = [1,2;2,1;1,1;1,3;3,2] 

A = 5×2

1 2 2 1 1 1 1 3 3 2

B = [0.5,0.5;2,2]

B = 2×2

0.5000 0.5000 2.0000 2.0000

I compute for every point in A the nearest Point from B. I use dsearchn

k = dsearchn(B,A)

k = 5×1

2 2 1 2 2

Now I want to give every point in B the next points from A. Making for every point in B a list of nearest points from A. Like point B(2,:) ans = 2 , 2 has the next points A(1,:),A(2,:),A(4,:) and A(5,:). I have no clue how to do it right and efficient.

[Rik]

What is the actual output in terms of Matlab variables you want?

[Lars Urban]

I thought about a structure array where it is divided by coordinate of B in x and y and the a list of double from A.x and A.y

Answer 1

[Bruno Luong]

See if s is what you want or not (not clear for me)

A = [1,2;2,1;1,1;1,3;3,2] 

A = 5×2

1 2 2 1 1 1 1 3 3 2

B = [0.5,0.5;2,2]

B = 2×2

0.5000 0.5000 2.0000 2.0000

k = dsearchn(B,A)

k = 5×1

2 2 1 2 2

AA = accumarray(k, (1:size(A,1))', [], @(r) {A(r,:)});
s = struct('B', num2cell(B,2), 'A', AA)

s = 2×1 struct array with fields:
    B
    A

s(1).B

ans = 1×2

0.5000 0.5000

s(1).A

ans = 1×2

1 1

s(2).B

ans = 1×2

2 2

s(2).A

ans = 4×2

1 2 2 1 1 3 3 2

[Lars Urban]

Yes this is what i want at the end. Sorry for the bad description of my problem. Thank you!

Answer 2

[David Hill]

Look at pdist2

A = [1,2;2,1;1,1;1,3;3,2] ;
B = [0.5,0.5;2,2];
pdist2(A,B)

ans = 5×2

1.5811 1.0000 1.5811 1.0000 0.7071 1.4142 2.5495 1.4142 2.9155 1.0000

[Lars Urban]

It would be end in the same problem where i have to sort each point with the closest distance to one point B. I have found w dsearch for each point in A the closest point in B but i want to sum for every point in B their closest points from A.

[David Hill]

I don't understand your comment. Each column above gives the distance between each point in B with all the points in A. You could sort each column and then index into A to provide the sorted listing of the closest points of A to each point in B.