question on security warning message "this file contains potentially unsafe dynamic content" with Manipulate notebook
- To: mathgroup at smc.vnet.net
- Subject: [mg123830] question on security warning message "this file contains potentially unsafe dynamic content" with Manipulate notebook
- From: "Nasser M. Abbasi" <nma at 12000.org>
- Date: Wed, 21 Dec 2011 06:57:04 -0500 (EST)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
I am finally able to reproduce this message that I get once in a while. This in on V8.04, on windows 7. While trying things, I found how to make Mathematica generate the above message when I open a notebook with Manipulate in it. I will show the code that generated this message, and have a follow up question on Dynamic module inside Manipulate. First the error message screen shot: http://12000.org/tmp/dec_20_2011/error_message.png I now hit 'enable dynamics' and all seems well. But each time I reopen the notebook, I get the message again. So I do not understand this warning message, and why it comes up. The code to generate it is: -------------------------------------- Manipulate[ DynamicModule[{p}, p["x"] = 0; Row[{Dynamic[ Refresh[p["x"]++; Row[{"p[x]=", p["x"]}], TrackedSymbols -> {n}]]}] ], Button["update counter", n++], {{n,0}, None} ] ----------------------------------------- The above is on its own notebook, with nothing else in the notebook. I close M, then start it, then open the notebook, and I see the above message. Now, to remove the message, I found out that the use of p["x"] is what seems to be causing it. Because I closed the above notebook, and made a new notebook with this code: ------------------------- Manipulate[ DynamicModule[{p}, p = 0; Row[{Dynamic[Refresh[p++; Row[{"p=", p}], TrackedSymbols -> {n}]]}] ], Button["update counter", n++], {{n, 0}, None} ] ----------------------------- Then closed M, and started it again, and opened the above notebook, and now I do not see the warning message. The only difference is that one has p["x"] and the other has just p. So, why is using p["x"] causing the security warning message? p["x"] is an indexed object as explained in this page: http://reference.wolfram.com/mathematica/tutorial/MakingDefinitionsForIndexedObjects.html And now for the follow up question: In the second example above, where the warning do not show up, I noticed that the value of 'p' is not saved when I close the notebook. So that when I start the notebook again, I was expecting the counter, which is the value of p,to be at the value it was before I closed the notebook. This is because 'p' belongs to a DynamicModule[] (just like Manipulate control variables keep the same state when one closes the notebook and open it again.) What do I need to change in example 2 above to achieve this? I must be doing something silly, I just do not see it now. thank you, --Nasser
