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Re: DynamicModule question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg88568] Re: DynamicModule question
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Fri, 9 May 2008 03:20:57 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <fvudm6$eb5$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de

Hi,

try

SetAttributes[foo, HoldAll]
foo[data_] :=
  DynamicModule[{size = 300},
   Column[{Slider[Dynamic[size], {100, 500}],
     Dynamic@PieChart[data, ImageSize -> size]}]]

and

lst = #/(Plus @@ #) & /@ Table[Random[], {5}, {3}];

Do[
  data = lst[[i]]; Pause[1], {i, 1, 3}]

Regards
   Jens

J. McKenzie Alexander wrote:
> Can someone please explain to me why the following happens?  It's a  
> silly little example to illustrate a problem I ran into recently...
> 
> First, evaluate the following in separate cells:
> 
> 	Needs["PieCharts`"];
> 
> 	data = {.25, .75}
> 
> Then evaluate the following:
> 
> 	DynamicModule[{size = 300},
> 	 Column[{
> 	   Slider[Dynamic[size], {100, 500}],
> 	   Dynamic[PieChart[data, ImageSize -> size]]
> 	   }]
> 	 ]
> 
> Notice that you can not only resize the graphic by  dragging the  
> slider, but if you change the definition of data, that's reflected  
> automatically in the graphic as well.
> 
> However, suppose you wrap the DynamicModule in a function like so:
> 
> 	foo[data_] := DynamicModule[{size = 300},
> 	  Column[{
> 	    Slider[Dynamic[size], {100, 500}],
> 	    Dynamic@PieChart[data, ImageSize -> size]
> 	    }]
> 	  ]
> 
> Now evaluate
> 
> 	foo[ data ]
> 
> If you change the definition of data in the notebook, the second  
> DynamicModule doesn't update the pie charts. I don't understand what  
> breaks when you wrap the DynamicModule in a function definition.
> 
> Many thanks!
> 
> Jason
> 
> 
> --
> Dr J. McKenzie Alexander
> Department of Philosophy, Logic and Scientific Method
> London School of Economics and Political Science
> Houghton Street, London WC2A 2AE
> 
> 
> 
> 
> Please access the attached hyperlink for an important electronic communications disclaimer: http://www.lse.ac.uk/collections/secretariat/legal/disclaimer.htm
> 


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