Re: newbie list question

• To: mathgroup at smc.vnet.net
• Subject: [mg115024] Re: newbie list question
• From: Bob Hanlon <hanlonr at cox.net>
• Date: Tue, 28 Dec 2010 06:52:58 -0500 (EST)

```listA = {4, 5, 8, 2, 6, 4};
listB = {8, 4, 2};

Map[Position[listA, #][[1, 1]] &, listB]

{3, 1, 4}

Which can also be written as

Position[listA, #][[1, 1]] & /@ listB

{3, 1, 4}

Bob Hanlon

---- Gareth Edwards <gareth.edwards at cubicmotion.com> wrote:

=============
Hi,

Liking Mathematica a lot, but struggling with the early part of the learning curve, i.e. don't know what I don't know...

What would be the neatest syntax for finding the first location of elements from one list in another? For example:

listA = { 4,5,8,2,6,4 }
listB = { 8,4,2 }

I would like a function to return {3,1,4} in this case (the first location in A of each element in B)

Many thanks!

```

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