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 Hermann Meier noted about Sort. ------------------- 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"}], ButtonStyle->"MainBookLink"]}]], "Text"] (************) ----------------- Regards, Ted Ersek