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Re: how uncouple dynamic objects?
*To*: mathgroup at smc.vnet.net
*Subject*: [mg109444] Re: how uncouple dynamic objects?
*From*: Albert Retey <awnl at gmx-topmail.de>
*Date*: Tue, 27 Apr 2010 07:41:06 -0400 (EDT)
*References*: <hr65qt$jp8$1@smc.vnet.net>
Am 27.04.2010 10:04, schrieb Murray Eisenberg:
> Here's a simple example of a more complicated situation where I define a
> function that takes a function as argument and uses Manipulate to
> produce its output:
>
> fplot[f_]:= Manipulate[
> Plot[f[x+a],{x,-2,2}],
> {a,0,2}]
> f[x_]:= x^2
> fplot[f]
>
> f[x_]:=x^3
> fplot[f]
>
> When I execute the second definition (with x^3) of f, it automatically
> changes the f used in the still-displayed output from the first call to
> fplot.
>
> How can I isolate the two instances -- and yet still use the same name
> for the two different functions? (Or is this not possible?)
Manipulate knows the TrackedSymbols-Option, if you put in everything
that needs to be tracked except for f it will behave as you require:
fplot[f_] :=
Manipulate[Plot[f[x + a], {x, -2, 2}], {a, 0, 2},
TrackedSymbols :> {a}]
It will isolate in the sense that the Manipulate just doesn't realize it
is still using an old definition of f. I can't say whether that will
cause problems or will isolate the two definition in every situation but
for your example it seems to work...
> Clearly this is an issue of the dynamic structure underlying
> Manipulate, and I'm willing to use a "direct" definition using a
> Dynmaic variable a with a control instead of the simpler
> Manipulate. But of course I'd prefer to be able to do it with
> Manipulate.
>
hth,
albert
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