Re: Sort problem
- To: mathgroup at smc.vnet.net
- Subject: [mg81692] Re: [mg81678] Sort problem
- From: Adriano Pascoletti <adriano.pascoletti at dimi.uniud.it>
- Date: Tue, 2 Oct 2007 05:22:40 -0400 (EDT)
- References: <200710010849.EAA23017@smc.vnet.net>
Don,
use the canonical order. From the help of Sort:
"Sort[list,p] applies the function p to pairs of elements in list
to determine whether they are in order. The default function p is
OrderedQ[{#1,#2}]&".
In[8]:= Sort[{{r, 2}, {a, 3}, {x, 4}}, OrderedQ[{#1[[1]], #2[[1]]}] & ]
Out[8]= {{a, 3}, {r, 2}, {x, 4}}
Adriano Pascoletti
On 1 ott 2007, at 10:49, Donald DuBois wrote:
> Hello,
>
> This Sort works
>
> In[32]:= Sort[{r, a, x}]
>
> Out[32]= {a, r, x}
>
> but this one doesn't:
>
> In[33]:= Sort[{{r, 2}, {a, 3}, {x, 4}}, #1[[1]] < #2[[1]] &]
>
> Out[33]= {{r, 2}, {a, 3}, {x, 4}}
>
>
> What am I doing wrong?
>
> Don
>
- References:
- Sort problem
- From: Donald DuBois <donabc@comcast.net>
- Sort problem