Re: Adding computed values to a Contourplot function
- To: mathgroup at smc.vnet.net
- Subject: [mg118591] Re: Adding computed values to a Contourplot function
- From: Peter Breitfeld <phbrf at t-online.de>
- Date: Tue, 3 May 2011 08:23:08 -0400 (EDT)
- References: <ipoioe$g1h$1@smc.vnet.net>
sigismond kmiecik 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
>
You can use Inset and Row like this:
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 -> Inset[
Style[Row[{HoldForm[b^2-4 a c]," = ",b^2-4 a c}],Large],
{5, 5}]]
--
_________________________________________________________________
Peter Breitfeld, Bad Saulgau, Germany -- http://www.pBreitfeld.de