Re: DeleteCases
- To: mathgroup at smc.vnet.net
- Subject: [mg42245] Re: DeleteCases
- From: "Shawn Kelly" <kellysm at ornl.gov>
- Date: Wed, 25 Jun 2003 01:53:39 -0400 (EDT)
- Organization: Virginia Tech, Blacksburg, Virginia, USA
- References: <bd8o3o$loi$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
To all that have responded, thanks for the help. I have included some of the solutions to my problem below: Complement[list1, list2] or... In[5]:= DeleteCases[list1, Alternatives @@ list2] Out[5]= {21, 41, 61} or... list3=DeleteCases[list1, _?(MemberQ[list2, #]&)] list3=Cases[list1, _?(!MemberQ[list2,#]&)] list3=Select[list1, !MemberQ[list2,#]&] or... In[1]:= Select[list1,Not[MemberQ[list2,#]]&] Out[1]= {21,41,61} or In[2]:= DeleteCases[list1,y_/;MemberQ[list2,y]] Out[2]= {21,41,61} "Shawn Kelly" <kellysm at ornl.gov> wrote in message news:bd8o3o$loi$1 at smc.vnet.net... > I have twos lists I want to compare with one another and delete the cases > where the elements in list1 match list2. For example: > > list1={21,41,61,71,81} > list2={71,73,75,77,79,81} > > I want the new list3 to read: > list3={21,41,61} > > It seems to me that the following should work: > list3=DeleteCases[list1,list2] > > Any thoughts? > > Thanks > > Shawn > >