Re: Replacement Rule
- To: mathgroup at smc.vnet.net
- Subject: [mg32071] Re: [mg32064] Replacement Rule
- From: jmt <jmt at agat.net>
- Date: Sat, 22 Dec 2001 04:22:42 -0500 (EST)
- References: <200112210857.DAA25218@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Try
yourList/.{x_?AtomQ,y_AtomQ}->x
On Friday 21 December 2001 09:57, Brian Higgins wrote:
> I have the following list
>
> l1={{1,2},{3,4},{5,6}};
>
> and then I operate on it with the following pattern/replacement rule
>
> In[3]:= l1 /. {x_, y_} -> x
>
> Out[3]= {1, 3, 5}
>
> This is what I would expect. Now consider the following list
>
> In[4]:= l2 = {{3, 4}, {5, 6}};
>
> Then I use the same pattern/replacement rule
>
> In[5]:=l2 /. {x_, y_} -> x
>
> Out[5]= {3, 4}
>
> I was hoping to get
>
> {3,5}
>
> What am I missing? The FullForm of l2 is basically the same structure
> as l1, as far as I can tell....
>
> Brian
- References:
- Replacement Rule
- From: bghiggins@ucdavis.edu (Brian Higgins)
- Replacement Rule