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Re: Automatic update of variables

• To: mathgroup at smc.vnet.net
• Subject: [mg110329] Re: Automatic update of variables
• From: telefunkenvf14 <rgorka at gmail.com>
• Date: Sun, 13 Jun 2010 04:12:24 -0400 (EDT)
• References: <huvk4q$rq0$1@smc.vnet.net>

On Jun 12, 4:31 am, Antonio De Ju=E1rez <adejua... at gmail.com> wrote:
> Sometimes, I would find useful a method to update variables
> automatically. For example, given the delayed rule
>
> b:=3 a+1;
>
> it would be useful to have b updated whenever a is assigned a new
> value, like a=37. Is there any method to do this in Mathematica?
>
> Thanks,
>
>    Antonio.

You could tell Mathematica to treat b as Dynamic:

Dynamic[b]

b := 3 a + 1;

Each time you change a, b now reflects the change.

a = 2

a = 3

-RG