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Re: Strange behavior of Sort
*To*: mathgroup at smc.vnet.net
*Subject*: [mg12997] Re: [mg12941] Strange behavior of Sort
*From*: Sean Ross <seanross at worldnet.att.net>
*Date*: Sun, 28 Jun 1998 02:52:19 -0400
*References*: <199806240744.DAA03200@smc.vnet.net.> <3591C786.6C9F@worldnet.att.net> <359259A6.52C7D61@siu.edu>
*Sender*: owner-wri-mathgroup at wolfram.com
Edward Neuman wrote:
>
> Sean Ross wrote:
>
> > Edward Neuman wrote:
> > >
> > > In Mathematica 3.0:
> > >
> > > In[5]:=
> > > li={1/Sqrt[2], 1, -Sqrt[2]};
> > >
> > > In[7]:=
> > > Sort[li]//InputForm
> > >
> > > Out[7]//InputForm=
> > > {1, 1/Sqrt[2], -Sqrt[2]}
> > >
> > > Sort doesn't work properly on this list.
> > >
> > > Edward Neuman
> >
> > What would you like it to do instead? I think that
> > {1,1/Sqrt[2],-Sqrt[2]} is in proper order from greatest to smallest
> > already.
>
> Sean:
>
> What do you think about this:
>
> In[2]:=
> Sort[ {1, 1/Sqrt[2], -Sqrt[2]} ]//InputForm
>
> Out[2]//InputForm=
> {1, 1/Sqrt[2], -Sqrt[2]}
>
> By default, Sort rearranges members of the list so that they are in the
> ascending order.
>
> Regards,
>
> Edward Neuman
OK, I see your point now. A more clear way to state it would be:
In[2]:=
Sort[{1,1/Sqrt[2.],-Sqrt[2.]}]
Out[2]=
{-1.41421,0.707107,1}
In[3]:=
Sort[{1,1/Sqrt[2],-Sqrt[2]}]
Out[3]=
{1,1/Sqrt[2],-Sqrt[2]}
It seems clear that Sort does not convert the members of the list into
Real numbers in order to Sort them. I wonder what the criteria is for
unevaluated expressions?
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