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MathGroup Archive 2012

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Re: How can I make a sequence that includes lists?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg125476] Re: How can I make a sequence that includes lists?
  • From: Ray Koopman <koopman at sfu.ca>
  • Date: Thu, 15 Mar 2012 00:28:52 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <jjpbbn$p9r$1@smc.vnet.net>

On Mar 13, 10:46 pm, JasonE <ebaughja... at gmail.com> wrote:
> Hello folks,
>
> How can I make a sequence that includes lists?
> Ex:
> Sequence[apple, {rock, tree), {ocean, lake}]
>
> Here is my specific problem:
>
> I use this function to make associative arrays:
> IndexedVariable[var_,indicesValues__]:=With[{dict=List[indicesValues]},Scan[(var[#[[1]]]=#[[2]])&,dict]]
>
> (I got it from:http://www.physic.ut.ee/~kkannike/english/prog/mathematica/index.html...)
>
> Here is an example of how it takes arguments:
> IndexedVariable[f, {1, "a"}, {2, "b"}, {3, "c"}]
>
> In[2]:= f[1]
> Out[2]= a
>
> In[3]:= f[2]
> Out[3]= b
> ect...
>
> You can imagine, some associations are too long to type out by hand.
> Ex: {1, x1}, {2, x2}...{1000, x1000}
>
> When I make these associations programtically, I get a list back:
> {{1, x1}, {2, x2},...{1000, x1000}}
>
> IndexedVariable[f,{{1, x1}, {2, x2}, {3, x3}...{1000, x1000}}]
> does not work.
>
> It wants a sequence.
>
> How can I make a sequence that includes lists?
>
> Thanks,
> Jason
>
> Jason Ebaugh
> Contact: jasoneba... at jasonebaugh.info
> LinkedIn:www.linkedin.com/in/jasonebaugh

In[1]:= assoc = {{1, "a"}, {2, "b"}, {3, "c"}}

Out[1]= {{1,a},{2,b},{3,c}}

In[2]:= IndexedVariable[f,Sequence@@assoc]

Out[2]= IndexedVariable[f,{1,a},{2,b},{3,c}]



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