Re: RE: Context
- To: mathgroup at smc.vnet.net
- Subject: [mg71000] Re: [mg70985] RE: [mg70956] Context
- From: Sseziwa Mukasa <mukasa at jeol.com>
- Date: Sat, 4 Nov 2006 04:08:12 -0500 (EST)
- References: <200611030639.BAA21066@smc.vnet.net>
On Nov 3, 2006, at 1:39 AM, Virgilio, Vincent - SSD wrote:
> Below, a CompoundExpression contains a Begin. I think the Begin
> will not affect anything in that CompoundExpression. So Mathematica
> creates t in Global` rather than x`, which you see.
The answer is to consider $ContextPath.
> -----Original Message-----
> From: dh [mailto:dh at metrohm.ch]
To: mathgroup at smc.vnet.net
> Subject: [mg71000] [mg70985] [mg70956] Context
> fun[x_]:=( Begin[x];
> according to the manual one would think that the variable t in
> context x
No it will search for t in contexts specified in the context path, if
there's a DownValue for t specified in a context on the context path
and none in the current context, then the value in the other context
will be used. If you think about this for a second this behavior is
necessary because most of the built in functions are defined in the
System` context and if Begin overwrote the context path you'd lose
all the built in definition when you started a new context.
This explanation is in the further explanation section of the help on
> A symbol whose context name is not specified is looked up first in
> the current context, then in the contexts in $ContextPath.
> This command changes the current context, but not the context path.
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- RE: Context
- From: "Virgilio, Vincent - SSD" <Vincent.Virgilio@itt.com>