       Re: Re: Using Locators in Mathematica v6

• To: mathgroup at smc.vnet.net
• Subject: [mg76571] Re: [mg76472] Re: Using Locators in Mathematica v6
• From: DrMajorBob <drmajorbob at bigfoot.com>
• Date: Thu, 24 May 2007 06:01:40 -0400 (EDT)
• References: <f2u4tq\$jv5\$1@smc.vnet.net> <22238933.1179927432175.JavaMail.root@m35>

```Very nice!

Bobby

On Wed, 23 May 2007 04:07:04 -0500, Jens-Peer Kuska  =

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

> Hi,
>
> what is with
> data = Table[{x, 1 + 2*x + 0.5*Random[]}, {x, -2, 2, 0.2}];
>
> Manipulate[
>   DynamicModule[{points, dfit, plt},
>    points = Append[data, pnt];
>    dfit = Fit[points, {1, x}, x];
>    Plot[dfit, {x, -2, 2}, Evaluated -> True ,
>     Epilog -> {Point /@ data}]
>    ], {{pnt, {0, 0}}, Locator}]
>
> Regards
>    Jens
>
> Coleman, Mark wrote:
>> Greetings,
>>
>> I've been exploring some of the new dynamic interface elements in  =

>> Mathematica v6
>> and I must say they are very impressive indeed. I've managed to set-u=
p
>> some useful examples using Manipulate. Unfortunately the documentatio=
n
>> of
>>
>> One example I am working on involves the use of Locators. The example=

>> itself seem straightforward but I cannot quite get the effect I am
>> looking for.  I am hoping someone on MathGroup can point me in the ri=
ght
>> direction.
>>
>> Briefly, I want to illustrate the effects that outlier points an have=
on
>> a line of best fit. For my example, I generate a small random set of
>> points (x(i), y(i)), where y(i) = a + b x(i) + randomerror(i), for
>> values a and b. I then calculate the line of best fit using Fit[ ]. I=

>> next ListPlot[ ] the underlying set of points and overlay the resulti=
ng
>> line from Fit[ ]. So far very simple.
>>
>> In my dynamic example, I'd like to have a locator button appear on th=
e
>> graph such that the (x,y) location of the locator becomes an addition=
al
>> data point in the overall data set, and thereafter a new line of best=

>> fit is calcuated and displayed. Thus as the user moves the locator, a=

>> new best fit line is displayed.
>>
>> I'd appreciate any assistance other readers might offer.
>>
>> Thanks,
>>
>> -Mark
>
>

-- =

DrMajorBob at bigfoot.com

```

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