Re: Context headache
- To: mathgroup at smc.vnet.net
- Subject: [mg70932] Re: Context headache
- From: dh <dh at metrohm.ch>
- Date: Thu, 2 Nov 2006 06:47:07 -0500 (EST)
- References: <email@example.com>
a function that iterates over contexts can be made by specifying the
fully qualified symbol names. Here is an example. First we set up 2
symbols in 2 different contexts:
now we use a function that prints variables in these contexts:
> Hi all,
> I'm trying to write a Mathematica analysis package in which
> various data sets are distinguished by being placed in their
> own contexts, say data1`data, data2`data, etc. This is helpful
> in that you can always hop into a context to work with each
> data set individually. Of course, at some point, that method
> becomes too much of a chore and you want to automate things.
> I'm trying to make a function that iterates over several contexts;
> it will hop into the context, execute a function on the data in
> that context, save the result as another variable in that context
> and then hop back out.
> But as described in
> (thread aptly named "Nailing jelly to a tree"), you can't do this.
> As soon as you try evaluating the iterating function, all the
> variables inside it get poisoned with the Global` context. You
> might try fixing this by using more nails on the jelly, say
> a hideous construct like
> Evaluate[Symbol[$Context<>"result"]] =
> but since my actual functions are much more complicated than
> this simple example, any readability of the code goes right away.
> Is there any better workaround known that would allow
> iteration over multiple contexts?
> Or alternatively, since it seems like I'm trying to force contexts
> to do something they don't want to do, is there some better
> data encapsulation technique I haven't thought of yet?
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