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MathGroup Archive 1999

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Re: Lists to mask other lists

  • To: mathgroup at smc.vnet.net
  • Subject: [mg19076] Re: Lists to mask other lists
  • From: dkeith at hevanet.com
  • Date: Thu, 5 Aug 1999 01:35:00 -0400
  • References: <7o5hi2$rkt@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Aram,

MapThread will work. I use a pure function, but you can define one with
a name if you like.

In[1]:=
maskList = {1, 0, 0, 1, 1};

In[2]:=
realDealList = {aaa, bbb, ccc, ddd, eee};

In[3]:=
MapThread[If[#1 == 1, #2, "aram"] &, {maskList, realDealList}]

Out[3]=
{aaa, "aram", "aram", ddd, eee}


 article <7o5hi2$rkt at smc.vnet.net>,
  aram schiffman <aram at sirius.com> wrote:
> 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
>
>


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