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MathGroup Archive 2007

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Re: Re: How show Locator point and its image under a function?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg79941] Re: [mg79880] Re: How show Locator point and its image under a function?
  • From: DrMajorBob <drmajorbob at bigfoot.com>
  • Date: Thu, 9 Aug 2007 05:21:02 -0400 (EDT)
  • Organization: Deep Space Corps of Engineers
  • References: <f990t4$c2d$1@smc.vnet.net> <19482328.1186576411439.JavaMail.root@m35>
  • Reply-to: drmajorbob at bigfoot.com

But it doesn't.

Bobby

On Wed, 08 Aug 2007 03:43:15 -0500, Jens-Peer Kuska  =

<kuska at informatik.uni-leipzig.de> wrote:

> Hi Murray,
>
> Manipulate[
>   Row[{Framed@Graphics[Point[pt], PlotRange -> 5],
>     Framed@Dynamic[Graphics[Point[f[pt]], PlotRange -> 5]]}],
>   {{pt, {-1, 1/2}}, Locator}
>   ]
>
> may do it
> Regards
>    Jens
>
> Murray Eisenberg wrote:
>> The following code displays a fixed point and its image under a
>> specified function f:
>>
>>    f[{x_,y_}]:={2x+1,y+2}
>>    Module[{pt = {-1, 0.5}},
>>       Row[{
>>         Framed@Graphics[Point[pt], PlotRange -> 5],
>>         Framed@Graphics[Point[f[pt]], PlotRange -> 5]
>>       }]
>>     ]
>>
>> Now I want to have the point in the left-hand graphic to be dynamic,
>> controlled by a Locator, and to have its changed image under the
>> function to be shown in the right-hand graphic.
>>
>> The idea is something like the following (WRONG!) code:
>>
>>    DynamicModule[{pts={{0,0}}},
>>      Row[{
>>        LocatorPane[Dynamic[pts],Graphics[{},PlotRange->5]],
>>        Graphics[Dynamic[f/@pts],PlotRange->5]
>>      }]
>>    ]
>>
>> That code produces error messages, "1 is not a Graphics primitive or
>> directive", "2 is not a Graphics primitive or directive".
>>
>> How can it actually be done?
>>
>
>



-- =

DrMajorBob at bigfoot.com


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