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MathGroup Archive 2006

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Re: Context

  • To: mathgroup at smc.vnet.net
  • Subject: [mg70969] Re: [mg70956] Context
  • From: "Chris Chiasson" <chris at chiasson.name>
  • Date: Fri, 3 Nov 2006 01:39:16 -0500 (EST)
  • References: <200611021149.GAA15806@smc.vnet.net> <acbec1a40611020635m2fd171fdqb2d1f837b8f3491a@mail.gmail.com> <454A1513.6010508@metrohm.ch>

I should have said it with code.

If a text file contains the following 3 lines, I believe it should print "x`".

Begin["x`"];
Print[Context[t]];
End[];



On 11/2/06, Daniel Huber <dh at metrohm.ch> wrote:
> Hi Chris,
> it does not matter how you load fun. You get the same behaviour if you
> use Get.
> Daniel
>
>
> Daniel
>
>
> Chris Chiasson wrote:
> > I am guessing that Get only has different behavior because it passes
> > the commands into the Kernel sequentially. fun is only sending a
> > single CompoundExpression (and it has already been parsed by the time
> > it has been defined).
> >
> > On 11/2/06, dh <dh at metrohm.ch> wrote:
> >>
> >> Hello,
> >>
> >> consider:
> >>
> >> fun[x_]:=( Begin[x];
> >>
> >>        Print[t];
> >>
> >>        End[];
> >>
> >>        );
> >>
> >> according to the manual one would think that the variable t in context x
> >>
> >> is printed. However, this is wrong! What is printed is Global`t.
> >>
> >> Therefore, the context to which a symbol belongs is determined during
> >>
> >> parsing and NOT execution.
> >>
> >> Can anybode give more insight and strict rules for this quirck?
> >>
> >> Daniel
> >>
> >>
> >>
> >
> >
>
>
> --
>
> Daniel Huber
> Metrohm Ltd.
> Oberdorfstr. 68
> CH-9100 Herisau
> Tel. +41 71 353 8585, Fax +41 71 353 8907
> E-Mail:<mailto:dh at metrohm.ch>
> Internet:<http://www.metrohm.ch>
>
>


-- 
http://chris.chiasson.name/


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