Re: Vector plot in cylindrical coordinates.

*To*: mathgroup at smc.vnet.net*Subject*: [mg20288] Re: Vector plot in cylindrical coordinates.*From*: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>*Date*: Tue, 12 Oct 1999 03:39:28 -0400*Organization*: Universitaet Leipzig*References*: <7tp85v$9ah@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Hi John, what means "cylindrical coordinates" ? The vector field f={fx,fy} depending on r and phi ? The vector field f={fr,fphi} depending on x and y or f={fr,fphi} on r and phi ? Since drawinf fr amd fphi show you allmost nothing I assume you want {fx[r,phi],fy[r,phi]} ? the following ma y help you: PlotVectorField[ r = Sqrt[x^2 + y^2]; phi = ArcTan[x, y]; {r*Cos[2phi], r*Sin[2phi]}, {x, -2, 2}, {y, -2, 2}] Regards Jens "I. Ioannou" wrote: > > Hi all, > > I want to plot a vector field in cylindrical coordinates. While all the > packages are there, I don't seem to be able to do this. Would anybody know > the specific instructions? > > I should add that this is a 2d vector field. Such fields are x-y > plottable with PlotVectorField (or something like that). When I try to > change coordinate systems with the VectorAnalysis package (again the name > might be slightly different; I'm not in the office) I don't get the > plotting package to recognize the new coordinates. > > I guess, a solution along these lines or in a somehow different way (e.g. > plotting streamlines) would work. > > Thanks for your help, John > -- > Ioannis I Ioannou phone: (206)-543-1372 > g-2 group, Atomic Physics fax: (206)-685-0635 > Department of Physics > University of Washington e-mail: iioannou at u.washington.edu