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# Discussion: Useful (I hope) List Logic Functions

Very Keynes
LSL is a Virus
Join date: 6 May 2006
Posts: 484
06-17-2007 18:08
Whilst develeping a reletivly complex script I descoverd that, although extensive, the list manipulaton functions in LSL were lacking logical functions, especialy those that can be used in Set Theory, so I developed the following functions to solve my problem and hope they are of use to others.
CODE
`//list logic//By Very Keynes - Please use or modify freely//list l1 = ["a","b","c","d"];			//test listslist l2 = ["a","1","b","2","c","3"];list ListXorY(list lx, list ly) // add the lists eleminating duplicates{	list lz = []; integer x;	for (x = 0; x < llGetListLength(ly); ++x)	{		if (~llListFindList(lx,llList2List(ly,x,x))){;}		else {lz = lz + llList2List(ly,x,x);}	}	return lx + lz;}list ListXandY(list lx, list ly) // return a list of elements common to both lists{	list lz = []; integer x;	for (x = 0; x < llGetListLength(ly); x++)	{		if (~llListFindList(lx,llList2List(ly,x,x))){lz = lz + llList2List(ly,x,x);}		else {;}	}	return lz;}list ListXnotY(list lx, list ly) // return elements in X that are not in Y{	list lz = []; integer x;	for (x = 0; x < llGetListLength(lx); x++)	{		if (~llListFindList(ly,llList2List(lx,x,x))){;}		else {lz = lz + llList2List(lx,x,x);}	}	return lz;}list ListXxorY(list lx, list ly) // reteurn elements that are in X or Y but not both{	return ListXnotY( lx,  ly) + ListXnotY( ly,  lx);}integer ListXequY(list lx, list ly){	if(llList2CSV(ListXnotY(lx,ly))=="")return TRUE;	else return FALSE;}	integer ListXneqY(list lx, list ly){	if(llList2CSV(ListXnotY(lx,ly))=="")return FALSE;	else return TRUE;}// Code used to test the abovedefault{	state_entry()	{		llOwnerSay("testing functions");		llOwnerSay("Elements in x = " + llList2CSV(l1));		llOwnerSay("Elements in y = " + llList2CSV(l2));		llOwnerSay("Elements in x or y = " + llList2CSV(ListXorY(l1,l2)));		llOwnerSay("Elements in both x and y = " + llList2CSV(ListXandY(l1,l2)));		llOwnerSay("Elements that are in x but not in y = " + llList2CSV(ListXnotY(l1,l2)));		llOwnerSay("Elements that are in y but not in x = " + llList2CSV(ListXnotY(l2,l1)));		llOwnerSay("Elements that are in x or y but not both = " + llList2CSV(ListXxorY(l1,l2)));		llOwnerSay("list x == y = " + (string)ListXequY(l1,l2));		llOwnerSay("list x == x = " + (string)ListXequY(l1,l1));		llOwnerSay("list y != x = " + (string)ListXneqY(l2,l1));		llOwnerSay("list y != y = " + (string)ListXneqY(l2,l2));			}}`
The Librarian
Join date: 4 Nov 2002
Posts: 1,423
06-29-2007 00:18
/15/ac/191527/1.html
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Senuka Harbinger
A-Life, one bit at a time
Join date: 24 Oct 2005
Posts: 491
06-29-2007 07:04
Wow. Incredibly useful learning tool for me, as data manipulation with LSL has always been my weakest spot.
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The function is working perfectly fine. It's just not working the way you wanted it to work.
Kidd Krasner
Registered User
Join date: 1 Jan 2007
Posts: 1,938
06-29-2007 19:07
I suggest not confusing boolean and set operators. It's union, not or, intersection, not and.
Espresso Saarinen
old geek
Join date: 22 Jan 2006
Posts: 93
07-03-2007 12:17
uh, this stuff does not compile for me

if ((integer)~llListFindList(lx,llList2List(ly,x,x)))

barfs at the ~
Very Keynes
LSL is a Virus
Join date: 6 May 2006
Posts: 484
07-12-2008 12:25
From: Espresso Saarinen
uh, this stuff does not compile for me

if ((integer)~llListFindList(lx,llList2List(ly,x,x)))

barfs at the ~

the type casting was for compatability with an earlyer version of LSLEditor, I have edited the code to remove them and it should compile and run fine
Hewee Zetkin
Registered User
Join date: 20 Jul 2006
Posts: 2,702
07-12-2008 12:32
I believe the (in)equality functions are incorrect. You test whether ListXnotY() is (non)empty, but if there were elements in Y that are not in X, it would consider the lists equal. You might want to use your ListXxorY() there instead.