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Automatic update of variables

• To: mathgroup at smc.vnet.net
• Subject: [mg110291] Automatic update of variables
• From: Antonio De Juárez <adejuarez at gmail.com>
• Date: Sat, 12 Jun 2010 05:31:11 -0400 (EDT)

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.