Re: Converting a mapping into a well-defined function
- To: mathgroup at smc.vnet.net
- Subject: [mg56533] Re: [mg56499] Converting a mapping into a well-defined function
- From: Sseziwa Mukasa <mukasa at jeol.com>
- Date: Thu, 28 Apr 2005 02:40:28 -0400 (EDT)
- References: <200504270153.VAA01768@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
On Apr 26, 2005, at 9:53 PM, Gilmar wrote:
> Dear Mathematica User Friends:
>
> I need to build a module that takes a non-empty set A
> (whose elements are 2-tuples), and appends (or not) those 2-tuples
> to a set B according to the following criteria:
>
> if A defines a mapping:
>
> A(a)=5, A(b)=27, A(a)=14, A(c)=4, A(e)=94, A(b)=6, A(d)=9, A(e)=4
>
> them the module converts the mapping A into a well-defined function:
>
> A(a)=5, A(b)=27, A(c)=4, A(d)=9, A(e)=94.
>
> Thank you for your help
You could try
module[a_]:=First[First[#]]&/
@Split[Sort[Transpose[{a,Range[Length[a]]}],OrderedQ[{{#1[[1,1]],#1[[2]]
},{#2[[1,1]],#2[[2]]}}]&],#1[[1,1]]==#2[[1,1]]&]
Regards,
Ssezi
- References:
- Converting a mapping into a well-defined function
- From: "Gilmar" <gilmar.rodriguez@nwfwmd.state.fl.us>
- Converting a mapping into a well-defined function