Q: Union and SameTest Option
- To: mathgroup at smc.vnet.net
- Subject: [mg16016] Q: Union and SameTest Option
- From: Clemens Frey <btml01 at uni-bayreuth.de>
- Date: Sat, 20 Feb 1999 02:52:06 -0500
- Sender: owner-wri-mathgroup at wolfram.com
Hi Mathematica-Groupers!
Can anybody explain to me what's going on here ?
In[270]:=
Union[ {{a,b,1},{a,c,1},{x,y,2},{a,b,2}},
SameTest->(#1[[2]]===#2[[2]]&) ]
Out[270]=
{{a,b,1},{a,c,1},{x,y,2}}
is ok since the first and the last list element have the same second
component. But what is wrong here now ?
In[272]:=
Union[ {{a,b,1},{a,c,1},{x,y,2},{a,b,2}},
SameTest->(#1[[3]]===#2[[3]]&) ]
Out[272]=
{{a,b,1},{a,b,2},{a,c,1},{x,y,2}}
Thanks in advance
Clemens
------------------------------------------------------------
Clemens Frey
Doctoral Student at the
Department of Mathematics/BITOEK
University of Bayreuth(Germany)
clemens.frey at uni-bayreuth.de
http://www.bitoek.uni-bayreuth.de/~Clemens.Frey
------------------------------------------------------------