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MathGroup Archive 2001

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Re: Working with strings

  • To: mathgroup at smc.vnet.net
  • Subject: [mg31952] Re: [mg31940] Working with strings
  • From: Ken Levasseur <Kenneth_Levasseur at uml.edu>
  • Date: Fri, 14 Dec 2001 04:21:13 -0500 (EST)
  • References: <200112130608.BAA01001@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Brian:

Here's a a way to do it with patterns and Outer:

In[30]:=
Outer[(#1 <> "x" <> #2) &,
    myString /. {{p___, "x", s___} -> Sequence[{p}, {s}]}] // Flatten
{"SxR", "SxK", "SxP", "SxG", "TxR", "TxK", "TxP", "TxG",
 "MxR", "MxK", "MxP", "MxG"}

Ken Levasseur
Math. Sci.
UMass Lowell

Brian Higgins wrote:

> I have a list of string characters that I would like to group in a
> particular way. The list has the following structure:
>
> {n UpperCase Characters, x, m UpperCase Characters}
>
> Here is an example:
>
> myString={"S", "T", "M", "x", "R", "K", "P", "G"}
>
> Now I would like to form the following groupings:
>
> {"SxR", "SxK", "SxP", "SxG", "TxR", "TxK", "TxP", "TxG", "MxR", "MxK",
> "MxP", \
> "MxG"}
>
> A brute force way of doing this is
>
> subString[n_] := Split[myString, UpperCaseQ[#2] && UpperCaseQ[#1]
> &][[n]];
>
> Flatten[Outer[StringJoin, Outer[StringJoin, subString[1],
> subString[2]],
>     subString[3]]]
>
> Does anyone have any elegant way of doing this with perhaps using
> replacement rules?
>
> Thanks much,
>
> Brian



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