Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Software » comp.soft-sys.math.mathematica

Topic: updating a simulation within Manipulate.
Replies: 1   Last Post: Mar 8, 2013 6:22 AM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
W. Craig Carter

Posts: 266
Registered: 9/10/05
updating a simulation within Manipulate.
Posted: Mar 7, 2013 10:48 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply



I *think* I've asked this question before, but I can't find it on mathgroup. In any case, I don't know the answer now.

Here is a simple example of a Manipulate that updates a graphic as long as a boolean is true. This method seems like a kludge to me---is it? If so, what would be a better way to do this.

This is a constructed example, the real case I am looking at is much more involved; but kudos to anyone who can make a reasonable facsimile of their signature by adjusting the random walker's bias....

randomStep[bias_, stepList_] :=
Module[{angle = RandomVariate[NormalDistribution[bias, 1]]},
Join[stepList, {Last[stepList] + {Cos[angle], Sin[angle]}}]]

walkerGraphic[stepList_, range_] :=
Graphics[GraphicsComplex[stepList, Disk /@ Range[Length[stepList]]],
PlotRange -> range {{-1, 1}, {-1, 1}}]

DynamicModule[
{walkerPath = {{0, 0}}},
Manipulate[
If[keepWalking, (* kludge warning---testing for If[True...] seems inefficient *)
walkerPath = randomStep[bias, walkerPath]
];
If[reset,
reset = False; keepWalking = False;
walkerPath = {{0, 0}}
];
walkerGraphic[walkerPath, range],
{{keepWalking, False}, {True, False}},
{{reset, False}, {True, False}},
Delimiter,
{{range, 20}, 0, 100},
{{a, 0}, -Pi, Pi,
AngularGauge[##, ImageSize -> 160 ,
ScaleOrigin -> {{-4 Pi, 4 Pi}, 1}] &}
]
]



W Craig Carter
Professor of Materials Science, MIT



Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.