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Re: Help Plotting director fields

  • To: mathgroup at smc.vnet.net
  • Subject: [mg120202] Re: Help Plotting director fields
  • From: Peter Pein <petsie at dordos.net>
  • Date: Wed, 13 Jul 2011 03:09:57 -0400 (EDT)
  • References: <ivh9lc$lq7$1@smc.vnet.net>

Am 12.07.2011 13:03, schrieb Liquid Crystal:
> Hello,
>
> I am trying to plot a director field for nematic liquid crystals.
> The form of the director is, in pseudo-mathematica
>
> n = {Cos[theta],Sin[theta]}
>
> Where:
>
> theta = s ArcTan[y/x] + theta_0
>
> If you reference the following links, you will see the various
> disinclinations induced in the director field by choosing various s
> and theta_0
>
> http://learnliquid.blogspot.com/2011/07/test.html
>
> However, using the following code I am not able to produce these images.
> Any suggestions?
>
> AAA = {Cos[-1/2 ArcTan[y/x] + 0/2], Sin[-1/2 ArcTan[y/x] + 0/2]}
>
> StreamPlot[AAA, {x, -1, 1}, {y, -1, 1}, StreamPoints ->  12,
>   AspectRatio ->  1, StreamScale ->  None]
>
> Thank you,
>
> LL
>

Hi,

it works here with ArcTan[x,y] in place of ArcTan[y/x] :-)

Peter



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