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MathGroup Archive 2003

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Re: slope fields

  • To: mathgroup at smc.vnet.net
  • Subject: [mg40179] Re: slope fields
  • From: Selwyn Hollis <selwynh at earthlink.net>
  • Date: Tue, 25 Mar 2003 03:03:58 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Tom,

Here's a little function that should be helpful:

<< Graphics`PlotField`;
PlotSlopeField[expr_, {t_,t1_,t2_}, {y_,y1_,y2_}, opts___?OptionQ] := 
PlotVectorField[{1,expr}, {t,t1,t2}, {y,y1,y2}, opts, 
ScaleFunction->(1&), Axes->True]

Examples:

PlotSlopeField[ t - y, {t, 0, 2}, {y, 0, 2}]

PlotSlopeField[t - y, {t, 0, 2}, {y, 0, 2},
    PlotPoints -> {9,7}, ScaleFactor->.2, ColorFunction->(Hue[0]&)]


-----
Selwyn Hollis
http://www.math.armstrong.edu/faculty/hollis



On Monday, March 24, 2003, at 04:28  AM, Tom wrote:

> I am not a frequent user of Mathematica and many of you have assisted 
> me
>   in the past with implicit plots and vertical tangent lines etc.
>
> Now I have to teach slope fields to my AP Calculus students, and while
> we can see them on the TI calculators, I would like to generate some
> using Mathematica so I can make some good print-outs.  I have used
> vector plots in the past to illustrate the main ideas, but they "don't
> look like the slope fields" in texts and on AP's.
>
> Can anyone help me on this?
>
> Thanks so much.
>
> Tom Moriarty
>
>
>



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