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MathGroup Archive 2000

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Re: working with large strings.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg21644] Re: working with large strings.
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Fri, 21 Jan 2000 03:59:54 -0500 (EST)
  • Organization: Universitaet Leipzig
  • References: <86156m$jsj@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

?Characters

"Characters[\"string\"] gives a list of the characters in a string."

Make a list of characters form your string, and finaly whe all
replacements
are done use StringJoin[] to recreate the string.

Hope that helps
  Jens
 
dustin wrote:
> 
> If you want to write a program that alters elements of very large lists
> you can alter single elements with
> 
> largelist[[elementnumber]]=newvalue;
> 
> However, if you want to do this with a large string you have to do
> something like
> 
> largestring=StringTake[largestring,{1,elementnumber-1}]<>newvalue<>StringTake[largestring,{1,elementnumber+1}];
> 
> The problem with this is it requires making a whole new copy of the
> string to change just one element.  This will really slow a program down
> if you are working with large strings or have to repeat the process many
> times.
> 
> Does anyone know a way around this?
> 
> Dustin Soodak


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