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Question: Index of an element of a list?

Question:Index of an element of a list?

Declan 20 Maple 2015
March 04 2016
2

Hi, I need help finding the index of a given element in a list?

Say I have A:=[2,4,6,8,10,12], I want something that can do something like this:

index(A,6) 
                      3

 

EDIT:

Thanks, and sorry if my questions are trivial but I'm (clearly) not great with maple.

Now say I had two lists:

A:=[5,10,15,20,25,30,35,40,45,50]

B:=[7,14,21,28,35,42]

How would I get maple to return the index of the first element in list B that matches an element in list A, and the index of said element in list A? 


So something (remotely) like:

FirstMatch(B,A)
                        B[5], A[7]

(So I'm not looking for the first case of A[i]=B[i]. I just want i, j where A[i]=B[j])
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