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Re: newbie list question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg115021] Re: newbie list question
  • From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
  • Date: Tue, 28 Dec 2010 06:52:25 -0500 (EST)

On 26 Dec 2010, at 10:02, Gareth Edwards 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!
>

For example:

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

{3,1,4}

Andrzej Kozlowski


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