Dynamic problem (possibly simple)
- To: mathgroup at smc.vnet.net
- Subject: [mg92889] Dynamic problem (possibly simple)
- From: "m.g." <mg at michaelgamer.de>
- Date: Fri, 17 Oct 2008 05:22:44 -0400 (EDT)
Hi all,
I have the following problem: I want to dynamically plot a function
(tangential plane to a 3D Plot) One part is that I have to compute the
gradient of the function. I could not manage this (dynamically). I
have stripped of any unnessesary code to descripe the problem, so look
at this:
This makes a slider to select a point (works well, of course)
{Slider2D[Dynamic[aufpunkt], {{-2, -2}, {2, 2}}], Dynamic[aufpunkt]}
This should do a computation with "aufpunkt" (does not work)
DynamicModule[{x, y, a, b},
x = Dynamic[aufpunkt[[1]]]; y = Dynamic[aufpunkt[[2]]];
y^2
]
The output is not evaluated, I get, for instance, (0.5)^2, instead of
0.25. How can I manage to get the formula (y^2 in this case)
evaluatet?
Greetings
Mike