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Re: Dynamic: feature?
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, > Chris 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, Dynamic[f[a, b]] (* 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 http://homepages.nyu.edu/~jmg336/mathematica/weirddynamic.pdf Regards, -- Jean-Marc