RE: Sort

• To: mathgroup at smc.vnet.net
• Subject: [mg19188] RE: Sort
• From: "Ersek, Ted R" <ErsekTR at navair.navy.mil>
• Date: Tue, 10 Aug 1999 02:52:47 -0400
• Sender: owner-wri-mathgroup at wolfram.com

```I discovered something related behavior
-------------------
Sort, Union, Intersection, and Complement each
return a "sorted" list in the examples below, but
the lists aren't sorted according to their
numeric value.

In[1]:=
Sort[{0,-3,-Pi,5,Pi/2}]

Out[1]=
{-3, 0, 5, -Pi, Pi/2}

In[2]:=
Union[{0,-3,-Pi,5,Pi/2}]

Out[2]=
{-3, 0, 5, -Pi, Pi/2}

In[3]:=
Intersection[{-3,5,-Pi},{-3,0,5,-Pi,Pi/2}]

Out[3]=
{-3, 5, -Pi}

In[4]:=
Complement[{-3,0,5,-Pi,Pi/2},{0,Pi/2,6,8}]

Out[4]=
{-3, 5, -Pi}

-----------------------

I am pretty sure the lists above are sorted
by the method described in Section A.3.9 in
The Mathematica Book.  Below I give a hyperlink to
that section.

(************)
Cell[BoxData[
RowBox[{" ",
ButtonBox[
RowBox[{"A", ".3", ".9"}],
(************)

-----------------
Regards,
Ted Ersek

```

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