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When I do a StreamPlotof a rather complicated pair of differential equations, it loses some details.

For example:

StreamPlot[{Tan[y - x], 2^y - 2 Cos[Pi/3 - x]}, {x, -4, 4}, {y, -4, 4}] 

Here is the result:

enter image description here

Is there any way to:

  • Change the color near each of the critical points to a different set of colors?

  • Increase the level of detail near the saddle points and spirals? That is, add more streams?

  • Any way to make a collage (for example, a landscape variant in order to capture more of the rich details and global behaviors of all critical points, including the periodic ones in this particular example)?

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Look here Basins of Attraction –  Artes Sep 25 '13 at 21:36
    
@Artes: Thanks for the nice link! Regards –  Amzoti Sep 25 '13 at 23:49
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1 Answer

up vote 11 down vote accepted

There are a lot of options in StreamPlot. For example, you can do the following

StreamPlot[{Tan[y - x], 2^y - 2 Cos[Pi/3 - x]}, {x, -Pi, Pi}, {y, -4, 4}, 
   StreamPoints -> {{200, {{1, 0}, {Red, Thick}}, {{0, -3}, {Blue, Thick}}}, 0.1, 10}, 
   StreamScale -> {0.10, 100, 0.006},
   PlotRange -> {{-Pi, 3 Pi}, {-4, 4}}, AspectRatio -> 0.5, ImageSize -> 600] /. 
  Arrow[p_] :> {Arrow[p], Arrow@Transpose[{2 Pi, 0} + Transpose[p]]}

enter image description here

Here 200 is the whole number of the streams, {1,0} and {0,-3} are the reference points for the highlighted streams, 0.1 is a minimal distance between the streams, 10 is a maximum lengths of the streams, 0.10 is the lengths of the arrows, 100 is the number of points to represent the arrows, 0.006 is the size of the heads of the arrows, {2 Pi, 0} is the translation vector for the streams duplication.

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