Re: Sort problem

• To: mathgroup at smc.vnet.net
• Subject: [mg81692] Re: [mg81678] Sort problem
• 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}}

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
>

```

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