Re: building a list provided the position of element is known
- To: mathgroup at smc.vnet.net
- Subject: [mg68046] Re: building a list provided the position of element is known
- From: Bill Rowe <readnewsciv at earthlink.net>
- Date: Fri, 21 Jul 2006 05:37:39 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
On 7/20/06 at 6:04 AM, Arkadiusz.Majka at telekomunikacja.pl (Arkadiusz
Majka) wrote:
>I have two elements, say A and B and their positions in a three
>dimensional list. Eg {1,3} means that position of A is 1 , position
>ob is 3 and a list is given {A,_,B}. {3,2} corresponds to {_,B,A},
>{3,3} corresponds to {_,_,{A,B}}.
>How can I code it in Mathematica using any number of elements and a
>list of any length>0?
Use Position. From your description above
{Position[list,A][[1,1]],Position[list,B][[1,1]]}
will do what you want. This solution implicitly assumes either A and B only appear once in list or that you are only interested in the first occurrence of A and B
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