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MathGroup Archive 1999

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Re: Sort

  • To: mathgroup at smc.vnet.net
  • Subject: [mg19196] Re: [mg19152] Sort
  • From: BobHanlon at aol.com
  • Date: Tue, 10 Aug 1999 02:52:51 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

lst = {0, -Sqrt[2], 5};

Sort[lst]

{0, 5, -Sqrt[2]}

Sort[N[lst]]

{-1.41421, 0., 5.}

However, using N changes the form of the expressions. If you don't like the 
default Sort criteria, you can define a different Sort criteria and leave the 
form of the expressions alone.

Sort[lst, #1 < #2 &]

{-Sqrt[2], 0, 5}

Bob Hanlon

In a message dated 8/6/99 12:56:53 AM, hmeier at webshuttle.ch writes:

>Sort is not reliable. Try the following (Mathematica Version 4):
>
>In[1]:=
>Sort[{0, -Sqrt[2], 5}]
>
>Out[1]=
>{0, 5, -Sqrt[2]}
>
>In[2]:=
>Sort[{0., -Sqrt[2], 5}]
>
>Out[2]=
>{0., 5, -Sqrt[2]}
>
>
>One has to apply N to the list to get the correct result:
>
>In[3]:=
>Sort[N[{0., -Sqrt[2], 5}]]
>
>Out[3]=
>{-1.414213562, 0., 5.}
>


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