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MathGroup Archive 2004

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Re: Occurrence of a substring inside a list of strings

  • To: mathgroup at smc.vnet.net
  • Subject: [mg51238] Re: [mg51203] Occurrence of a substring inside a list of strings
  • From: DrBob <drbob at bigfoot.com>
  • Date: Sat, 9 Oct 2004 04:19:16 -0400 (EDT)
  • References: <200410080654.CAA24974@smc.vnet.net>
  • Reply-to: drbob at bigfoot.com
  • Sender: owner-wri-mathgroup at wolfram.com

Possibly StringMatchQ yields a nicer solution.

lst = {"abc", "abcd", "aabccaddbacdda", "adbacca"};
frag = "cca";
boole[True] = 1;
boole[a_] = 0;
superString::usage = "superString[
a][b] returns 1 if b is a super-string of a (a is a substring of b),
  else 0.";
superString[frag_String][
     a_String] := boole@StringMatchQ[a, "*" <> frag <> "*"]
Total[superString[frag] /@ lst]
Tr[superString[frag] /@ lst]
Plus @@ (superString[frag] /@ lst)

2

2

2

Bobby

On Fri, 8 Oct 2004 02:54:53 -0400 (EDT), János <janos.lobb at yale.edu> wrote:

> Hi,
>
> I have a simple list of strings like lst={"abc", "abcd",
> "aabccaddbacdda", "adbacca",....}.  Let's say I have a fragment called
> frag="dba".  I would like to know how many strings in lst contain
> minimum once the fragment frag.
>
> This is what I did:
>
> Length[Flatten[Map[Part[StringPosition[#, frag], All, 1] &,lst] ] ]
>
> Is there a better/faster way to calculate it ?
>
> Thanks ahead,
>
> János
> ----------------------------------------------
> Trying to argue with a politician is like lifting up the head of a
> corpse.
> (S. Lem: His Master Voice)
>
>
>
>



-- 
DrBob at bigfoot.com
www.eclecticdreams.net


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