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MathGroup Archive 2000

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Re: working with large strings.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg21666] Re: [mg21615] working with large strings.
  • From: "Mark Harder" <harderm at ucs.orst.edu>
  • Date: Fri, 21 Jan 2000 04:00:19 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Dustin,
    Have you tried StringReplacePart (online Help under Programming>String
Manipulation)?   Eg.,

In[19]:=    strng= "this is a string";
                StringReplacePart[strng,"change",{-6,-1}]
Out[19]=    "this is a change"

-mark

-----Original Message-----
From: dustin <dsoodak at virtu.sar.usf.edu>
To: mathgroup at smc.vnet.net
Subject: [mg21666] [mg21615] working with large strings.


>
>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<>StringTa
ke[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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