re: finding the right place in a RRN file

["Greg Thielen" <gregt@xxxxxxxx>]

Booth,

Since the records are sorted in the order that you want to search,
you can use a binary search technique.  It basically works by
eliminating half of the remaining records on each pass and is much
faster than you might think, even on very large files.  If you need
specifics on the algorithm, let me know.



On Sun, 30 Mar 97 13:26:38, boothm@earth.goddard.edu wrote:

>I'm thinking there's gotta be an easy way to do this.
>
>I have a sequential file, sorted into alphabetical order on a field called
>"LastName".  I want to process it as a subfile by Relative Record Number.
>
>But a user needs to be able  set the file at a particular "LastName",
>based on a keyed-in field called "GetName".  
>
>Is there an easy way to do that?
>Thanks.
>
>----------------------------------------------------------
>boothm@earth.goddard.edu
>----------------------------------------------------------


-------------------------
Greg Thielen
Innovative Systems Design
gregt@isda.com
http://www.isda.com


* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* This is the Midrange System Mailing List!  To submit a new message,   *
* send your mail to "MIDRANGE-L@midrange.com".  To unsubscribe from     *
* this list send email to MAJORDOMO@midrange.com and specify            *
* 'unsubscribe MIDRANGE-L' in the body of your message.  Questions      *
* should be directed to the list owner / operator: david@midrange.com   *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *