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Re: Output from a Dynamic Module

  • To: mathgroup at smc.vnet.net
  • Subject: [mg97777] Re: Output from a Dynamic Module
  • From: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>
  • Date: Sat, 21 Mar 2009 05:18:32 -0500 (EST)
  • References: <gpvhaj$gsm$1@smc.vnet.net>

Hugh,

To start with your last question, the solution would be to remove the
Dynamic from within the Export function.

As to your main question: I guess you don't want to use a global
variable? Indeed, that woud defeat the purpose of the module, i.e. to
hide the variable pts from the global scope. I don't have an elegant
solution. Perhaps copying pts to a global variable if it is your
intention to hide pts?

Cheers -- Sjoerd

On Mar 20, 9:41 am, Hugh Goyder <h.g.d.goy... at cranfield.ac.uk> wrote:
> In the toy example below I have a dynamic module where I adjust
> Locator points to form a curve. When I have got a  nice set of points
> I would like to output them so that they can be used in other
> calculations. I have provided a button to do this but can't see the
> best way forward. Normally the output from a module is the last line
> but here this is not possible. I give a bad method by using a
> temporary file but what other methods are there? (And why does the
> temporary file I import get up-dated even when I don't press the
> button?)
> Thanks
> Hugh Goyder
>
> DynamicModule[{pts},
>  pts = {{0, 0}, {1, 0}, {2, 0}, {3, 0}};
>  Column[{
>    Button["Assign points", Export["temp", Dynamic[pts], "List"]],
>    LocatorPane[Dynamic[pts],
>     Dynamic[
>      Plot[Interpolation[pts][x], {x, 0, 3}, Frame -> True,
>       Axes -> False, PlotRange -> {All, {-1, 1}}, ImageSize -> 7 72=
]]
>     ]
>    }]
>  ]
>
> pp = Import["temp"]



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