Prev: Problem with Simplify and Integrating a gaussian
Next: Developing C code with Workbench
From: divisor on 3 Mar 2010 05:52
Hello mathGroup:

I am trying to understand Dynamic[] better by customizing some of the
examples in the VirtualBook chapter about this. Specifically, I read
that Dynamic[] runs in the front-end.

Sometimes (partcularly when I have a bug,) the system appears to be
hung. When I run a regular command, it shows "Running.." in the window
title, so if it is taking too long, I can kill it (Alt-.).

But when Dynamic is running there does not seem to be any visual
indication. Is there a way for me to tell this as a user (so I can
take some action)? And if there is, do I need to kill all of Mathematica if
something I have given to Dynamic[] is hung?

TIA.

Roger Williams
Franklin Laboratory

From: John Fultz on 4 Mar 2010 05:28
You should the ChoiceDialog thread I contributed to earlier in the week. This
message contains pretty much all of the relevant stuff in the thread...

http://forums.wolfram.com/mathgroup/archive/2010/Mar/msg00021.html

In addition to that message, I'll say...

* Dynamics do not generally "run in the front end", except in some very trivial
cases. They may however, block the front end, if they're synchronous.

* No, there's generally no indication that it's an evaluation. In many cases,
such an indication would be undesirable and annoying.

* Better recovery from badly performing Dynamics is certainly something we're
still working on. But as I mention in the other email, every Dynamic is wrapped
in TimeConstrained, and you can control the value of that TimeConstrained...even
on a per-Dynamic basis if necessary, by doing something like...

Style[Dynamic[...], DynamicEvaluationTimeout->2]

Sincerely,

John Fultz
jfultz(a)wolfram.com
User Interface Group
Wolfram Research, Inc.


On Wed, 3 Mar 2010 05:52:02 -0500 (EST), divisor wrote:
> Hello mathGroup:
>
> I am trying to understand Dynamic[] better by customizing some of the
> examples in the VirtualBook chapter about this. Specifically, I read
> that Dynamic[] runs in the front-end.
>
> Sometimes (partcularly when I have a bug,) the system appears to be
> hung. When I run a regular command, it shows "Running.." in the window
> title, so if it is taking too long, I can kill it (Alt-.).
>
> But when Dynamic is running there does not seem to be any visual
> indication. Is there a way for me to tell this as a user (so I can
> take some action)? And if there is, do I need to kill all of Mathematica
> if
> something I have given to Dynamic[] is hung?
>
> TIA.
>
> Roger Williams
> Franklin Laboratory



 | 
Pages: 1
Prev: Problem with Simplify and Integrating a gaussian
Next: Developing C code with Workbench