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MathGroup Archive 1999

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Re: Lists to mask other lists

  • To: mathgroup at smc.vnet.net
  • Subject: [mg19112] Re: [mg19022] Lists to mask other lists
  • From: "David Park" <djmp at earthlink.net>
  • Date: Thu, 5 Aug 1999 01:35:29 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

>Howdy.
>
>I am trying to use one list to control the content of a second list.
>(It's not really masking, but...)
>
>Here's what I mean. Let's say
>
>maskList={1,0,0,1,1}
>
>
>realDealList={aaa,bbb,ccc,ddd,eee}
>
>(* could be filled with anything; same # elements as maskList }
>
>If a 1 appears at position n of maskList, then I leave the corresponding
>element of realDealList alone. But if a 0 appears, then I want to change
>the corresponding element of realDealList in some prescribed way. Let's
>say I change those elements to my first name (aram). Then realDealList
>would become
>
>{aaa,aram,aram,ddd,eee}
>
>I can do this in a loop, which is a really clunky solution, but isn't
>there a way I can Map across my list somehow?
>
>Thanks,
>Aram Schiffman
>


Try this Aram,

MapThread[If[#1 == 1, #2, aram] &, {maskList, realDealList}]

{aaa, aram, aram, ddd, eee}

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/



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