Talk:Symmetric difference: Difference between revisions

The symmetric difference should give one list which is the union of the two differences of the lists. The Perl example shows two lists. --[[User:Mwn3d|Mwn3d]] 23:19, 2 December 2009 (UTC)

 

 

Well, yes, Walter, it does use lists. Saying it doesn't use a list doesn't make it so. The lists used can look like SET elements, and indeed, represent elements in a SET. All you have to do is use the lists that ''note 1'' suggests to use (stating again, as does GAP, Pike, and Prolog use, among others, including REXX version 1 and 1.5). I have already executed the earlier version of the REXX version 2 with duplicates and it failed. I haven't gone through that process and validated it for you since the REXX version 2 was changed. If you could incorporate the new lists (using duplicates) as per the task's requirements (''note 1'') and post the output to show that it handles duplicates correctly, than you can delete the tag, and we all know thereafter that duplicates in the lists are handled correctly. (I don't want to modify your program nor its output.) If you want me to modify the REXX version 2 program and its output, I can do that for you, but since you have your moniker on it, I left them intact.) Note that other programming examples do use SETs, and some of them still incorporated duplicates in the element lists, and handled them correctly, even though they didn't use lists to represent SETs. I know it seems to be a nit, but I shouldn't have to prove it wrong (what if I or others don't have a REXX interpreter that could execute/interpret the code?), all is needed is to show that the REXX version 2 code can handle duplicates. That's why output is shown, as a verification. There isn't a need to have this discussion; if it's that hard to add duplicates to the lists and verify the output, just remove the tag. It would be much simpler to just add the duplicates (as per what ''note 1'' suggests) and show the output from using those lists. -- [[User:Gerard Schildberger|Gerard Schildberger]] ([[User talk:Gerard Schildberger|talk]]) 21:03, 16 December 2013 (UTC)