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