Question

I have two vectors

   A
   B

which are coupled, I mean that they define a certain scalar field at a given position.

I want to select 1000 random items from A and plot them versus other the other 1000 B coupled items.

With this code

  A_rand=random.sample(A,1000)

I select 1000 random values of A. For example they are A[1],A[50],A[49], etc.

How can I select B[1],B[50],B[49],etc. ?

I tried

 B_rand=B[(A==A_rand)]

but it returned just one value. What am I doing wrong?

Answer 1

You can select indexes, not items:

rand = random.sample(range(len(A)), 1000)

Then you can use A[rand[i]] and B[rand[i]].

For all selected items:

A_rand = [A[x] for x in rand]
B_rand = [B[x] for x in rand]