Re: Dynamic: feature?
- To: mathgroup at smc.vnet.net
- Subject: [mg88068] Re: Dynamic: feature?
- From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
- Date: Wed, 23 Apr 2008 04:10:12 -0400 (EDT)
- Organization: The Open University, Milton Keynes, UK
- References: <firstname.lastname@example.org>
Chris Osborn wrote:
> 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,
Weird. I witness the same behavior if the cells are evaluated in the
given order. However, ff one change the order of the assignments (i.e. b
first, then a) Dynamic works as expected. Evaluating the following
expressions in that order,
(* The first output cell is: f[a, b] *)
b /: f[a, b] = 45
(* The first output cell is now: 45 *)
a /: f[a, b] = 12
(* The first output cell is now: 12 *)
$Version => "6.0 for Mac OS X x86 (64-bit) (February 7, 2008)"
I have also recorded the sessions in a PDF file. See
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