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Dynamic: feature?

• To: mathgroup at smc.vnet.net
• Subject: [mg88015] Dynamic: feature?
• From: Chris Osborn <chrisosb at gmail.com>
• Date: Tue, 22 Apr 2008 06:25:57 -0400 (EDT)

I have a cell containing this:

Dynamic[f[a, b]]

Then I do this:

a /: f[a, b] = 12

and the dynamic cell updates to 12, as I would expect.

When I do this:

b /: f[a, b] = 45

The dynamic cell does *not* update for some reason.
It seems as though it does not realize an update has occurred when it
is associated with b.

Does anyone know why this is?

Thanks in advance,
Chris