How to get the difference between two lists?

[simplsol at aol.com]

Ken,
Is it possible to skip the "remove" items when the comprehensive list 
is built?
Paul Looney

-----Original Message-----
From: Ken Ray <kray at sonsothunder.com>
To: Use Revolution List <use-revolution at lists.runrev.com>
Sent: Sun, 03 Apr 2005 22:04:54 -0500
Subject: How to get the difference between two lists?

   I've got two lists - one with is the "comprehensive" list that is
return-delimited, like:

3
5
6
7
11
14
18
21

And another list which is the list I would like to *remove* from the
comprehensive list:

5
6
11
18

Which should give me:

3
7
14
21

I can of course do a repeat loop through the small list and remove those
items from the comprehensive list, but I'm wondering if there's a 
faster way
to do this. The numbers will always be sorted in ascending numeric 
order,
but there may be thousands of them, so I'm not looking forward to a 
repeat
loop.

Any ideas?

Ken Ray
Sons of Thunder Software
Web site: http://www.sonsothunder.com/
Email: kray at sonsothunder.com



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