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!