Find the position of elements of an array in another array and measure the euclidean distance between two array elements.

Suppose,

X = [11 12 13 21 22 23]

A = [11 22 21 13 12 23]

B = [11 13 21 23 22 12]

At first, I want to find the position of each elements of X in A and B. The answer would be as follows.

Position of X elements in A, P = [1 5 4 3 2 6]

Position of X elements in B, Q = [1 6 2 3 5 4]

Now I want to measure the euclidean distance between the elements of P and Q.

How can I do these?

Answer 1

[Ive J]

X = [11 12 13 21 22 23];
A = [11 22 21 13 12 23];
B = [11 13 21 23 22 12];

[~, Q] = ismember(X, B)

Q = 1×6

1 6 2 3 5 4

[~, P] = ismember(X, A)

P = 1×6

1 5 4 3 2 6

norm(P - Q)

ans = 4.2426

Answer 2

[KSSV]

d = sqrt(sum((A(X)-B(X)).^2));