Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
1999
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 1999

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: graphing inequalities

  • To: mathgroup at smc.vnet.net
  • Subject: [mg15908] Re: graphing inequalities
  • From: "Peltio" <pelt.ioNOS at PAMiol.it>
  • Date: Wed, 17 Feb 1999 23:33:48 -0500
  • Organization: Peltio Inc.
  • References: <7a28l3$1nq@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

In a message dated 2/8/99 4:53:24 AM, rubindl at aol.com writes:
>How do I plat an inequality, such as y - x > 6 in Mathematica?  I'd like
>to end up with a dashed line and the region above the line shaded.
>

Daniel,

Here's a little shell that lets you use FilledPlot to do what you want (the
options are to preserve the ability not to display the graph: they are a
little messy I know but...).


Needs["Graphics`FilledPlot`"]

MidFilledPlot[{f_>g_},{x_,xmin_,xmax_},opts___]:=
Module[
  {p1,p2},

p1=FilledPlot[{If[f>g,f,g],g},{x,xmin,xmax},DisplayFunction->Identity,opts];
  p2=Plot[f,{x,xmin,xmax},DisplayFunction->Identity];
        Show[p1,p2,
        DisplayFunction->(DisplayFunction
        /. {opts}/.DisplayFunction->$DisplayFunction )]
]

MidFilledPlot[{f_<g_},{x_,xmin_,xmax_},opts___]:=
Module[
  {p1,p2},

p1=FilledPlot[{If[g>f,g,f],f},{x,xmin,xmax},DisplayFunction->Identity,opts];
  p2=Plot[g,{x,xmin,xmax},DisplayFunction->Identity];
        Show[p1,p2,
        DisplayFunction->(DisplayFunction
        /. {opts}/.DisplayFunction->$DisplayFunction )]
]

Just drop in the inequality and it should work.

f=3Sin[x];
g=.2x^3-.2x+1;
Block[{$DisplayFunction=Identity},
p1=MidFilledPlot[{f>g},{x,-4,4}];
p2=MidFilledPlot[{f<g},{x,-4,4},Fills->Hue[.8]];
]
Show[GraphicsArray[{p1,p2}]]


Regards,
Peltio (peltioNOSPAM at usa.net)






  • Prev by Date: Sv: Text in Metafiles ...
  • Next by Date: "extending" BinCounts, need for speed
  • Previous by thread: Re: graphing inequalities
  • Next by thread: Experimental Data Analyst