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Re: can we use ListVectorPlot to plot arrows? (tail at point, head

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From	Roland Franzius <roland.franzius@uos.de>
Newsgroups	comp.soft-sys.math.mathematica
Subject	Re: can we use ListVectorPlot to plot arrows? (tail at point, head
Date	Mon, 3 Mar 2014 02:28:03 +0000 (UTC)
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Am 20.02.2014 09:26, schrieb Alan:
> Is there an option that will force ListVectorPlot to plot
> arrows from the points to the displacement? (By default,
> the point is in the middle of the arrow, not at its tail.)
> Using VectorPoints -> All, of course.

You can use VectorPlot as a primitive drawing tool and pimp the graphics 
by replacing arrows and other elements by more colorful primitive graphics

the following rule replaces all arrows in a Graphics[] generated by 
VectorPlot by a blue arrow and a red disc of radius 0.1 at the middle of 
head and tail.

redpointarrow=
{ Arrow[{{x_, y_}, {u_, v_}}] :>
   {Blue, Arrow[{{x, y}, {u, v}}], Red,
     Disk[{(x + u)/2, (y + v)/2}, 0.1]}}

The option  StreamPoints adds some integrated stream lines from the the 
gradient of the vector field.

field[x_,x_]:=Evaluate[Grad[(x^2 + y) Exp[(-x y)/(x^2 + y^2)], {x, y}]]

ps = VectorPlot[field[x,y]], {x, -2, 2}, {y, -2, 2},
    VectorPoints -> 7,
    VectorStyle -> {"DotArrow"},
    StreamPoints -> 12] /.  redpointarrow;

ps

-- 

Roland Franzius

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can we use ListVectorPlot to plot arrows? (tail at point, head at displacement) Alan <alan.isaac@gmail.com> - 2014-02-20 08:26 +0000
  Re: can we use ListVectorPlot to plot arrows? (tail at point, head at displacement) roby <roby.nowak@gmail.com> - 2014-03-02 06:51 +0000
  Re: can we use ListVectorPlot to plot arrows? (tail at point, head Roland Franzius <roland.franzius@uos.de> - 2014-03-03 02:28 +0000

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