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 > > Sent via Deja.com http://www.deja.com/ Share what you know. Learn what you don't.