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Re: Adding computed values to a Contourplot function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg118611] Re: Adding computed values to a Contourplot function
  • From: Dan <dflatin at rcn.com>
  • Date: Wed, 4 May 2011 06:35:17 -0400 (EDT)
  • References: <ipoioe$g1h$1@smc.vnet.net>

On May 3, 5:43 am, sigismond kmiecik <sigismond.kmie... at wanadoo.fr>
wrote:
> Hello to everybody
>
> How can I modify the code below (after Epilog) in order to add after
> "b^2-4ac=" its computed value and have everyhing framed?
>
> a=0.5;b=1;c=6;d=2;e=3;f=-30;
> ContourPlot[{a x^2  +b x*y + c  y^2  + d x  + e y - 30 == 0 }, {x, -12,
> 10}, {y, -8, 8}, ContourStyle-> {Red, Thick}, Axes -> True, AxesLabel-> {x,y} ,
>
> Frame-> False,ImageSize-> {550,400}, Epilog->{Text[Style["b^2 -
> 4ac=",FontSize-> 20],{5,5}]}]
>
> I haven't found in the Mathematica 8 Documentation center a similar example.
>
> Thanks
>
> Sigismond Kmiecik

Yet another form is

Epilog -> {
  Text[Style[StringForm["b^2 - 4ac = ``", b^2 - 4 a c], 20], {5, 5}]
  }

or for a 2D formatted look

Epilog -> {
  Text[
    Style[
      StringForm["`1` = `2`", HoldForm[b^2 - 4 a c], b^2 - 4 a c], 20
      ], {5, 5}
    ]
  }

StringForm[<string with x = `` parameter slots>, x] is similar to
sprintf and other standard computing language formatted text output.


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