Dynamic changing of variables

*To*: mathgroup at smc.vnet.net*Subject*: [mg96314] Dynamic changing of variables*From*: Patrick Scheibe <pscheibe at trm.uni-leipzig.de>*Date*: Wed, 11 Feb 2009 05:22:24 -0500 (EST)

Hi, assume the following code lines: DynamicModule[{a, b = 0}, a = Dynamic[Sin[b]]; Column[{ Dynamic[a], Slider[Dynamic[b], {0, 2*Pi}] }] ] In order to update "a" with the actual value of Sin[b] I need Dynamic around it. Unfortunately, now the variable "a" is invisibly wrapped and completely useless for further calculations. I'm not able to calculate even a+1 inside the DynamicModule. DynamicModule[{a, b = 0}, a = Dynamic[Sin[b]]; Column[{ Dynamic[a+1], Slider[Dynamic[b], {0, 2*Pi}] }] ] If I'm not just too stupid and this behaviour is intended, then I'm wondering whether this doesn't lead to problems when you have more complex constructs with several dynamic variables. Cheers Patrick PS: I was just pointed by another person on this and I found a way around it. So cannot provide a real problem I'm having. Nevertheless, I would be glad to know what you think since I couldn't really find the point in the documentation where this is explained.