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Re: How to add a Locator (Tooltip) to RootLocusPlot?

• To: mathgroup at smc.vnet.net
• Subject: [mg128634] Re: How to add a Locator (Tooltip) to RootLocusPlot?
• From: "Eduardo M. A. M. Mendes" <emammendes at hotmail.com>
• Date: Sun, 11 Nov 2012 01:29:28 -0500 (EST)
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• References: <20121110070932.E12846972@smc.vnet.net> <CAEtRDSfrGDhPHreJ8u=ugVVJPC1iMhfAsQ4jdCBDb1_6WvsPMQ@mail.gmail.com>

Hello

Many thanks.  

It would be a good opportunity for me to learn a bit more of Mathematica.  Many thanks again.

Regards

Ed

On Nov 10, 2012, at 5:02 PM, Bob Hanlon <hanlonr357 at gmail.com> wrote:

> rlPlt = RootLocusPlot[
>   k (s^2 + 2 s + 4)/
>     (s (s + 4) (s + 6) (s^2 + 14/10 s + 1)),
>   {k, 0, 150}];
>
> roots[s_, loc_] = Solve[
>   loc (s^2 + 2 s + 4)/
>      (s (s + 4) (s + 6) (s^2 + 14/10 s + 1)) == -1,
>   s];
>
> Manipulate[
> Show[
>  rlPlt,
>  Graphics[{Gray, AbsolutePointSize[8],
>    Tooltip[Point[#],
>       "k==" <> ToString[loc]] & /@
>     ({Re[s], Im[s]} /.
>       roots[s, loc])}]],
> {{loc, 50, "Gain (k)"}, .5, 150, .5,
>  Appearance -> "Labeled"}]
>
>
> Bob Hanlon
>
>
> On Sat, Nov 10, 2012 at 2:09 AM, Eduardo Mendes <emammendes at hotmail.com> wrote:
>> Hello
>>
>> I wonder whether someone out there would know how to add a Locator or
>> Tooltip or something else that allows me to see the values of the
>> parameter k (See command below) when the mouse passes over the resulting
>> curves? Unfortunately I have no idea on how to do it.
>>
>>
>> RootLocusPlot[k (s^2+2 s+4)/(s(s+4)(s+6)(s^2+1.4s+1)),{k,0,150}]
>>
>> Many thanks
>>
>> Ed
>>
>>
>>
>

• References:
  • How to add a Locator (Tooltip) to RootLocusPlot?
    • From: Eduardo Mendes <emammendes@hotmail.com>