how change color of directed edges for GraphPlot

*To*: mathgroup at smc.vnet.net*Subject*: [mg87113] how change color of directed edges for GraphPlot*From*: Murray Eisenberg <murray at math.umass.edu>*Date*: Tue, 1 Apr 2008 03:21:41 -0500 (EST)*Organization*: Mathematics & Statistics, Univ. of Mass./Amherst*Reply-to*: murray at math.umass.edu

I have a directed graph to display using GraphPlot: a=RotateVertices[EmptyGraph[4],-(\[Pi]/4)]; a=SetGraphOptions[a,EdgeDirection->True]; a=AddEdges[a,{{1,2},{2,3},{2,4},{3,1},{4,1},{4,3}}]; I want to display it using GraphPlot... GraphPlot[a, Method -> None, DirectedEdges -> True, VertexRenderingFunction -> ({Black, Disk[#1, 0.02]} &)] ... but I want the edges and the arrows to be Black and not the default brown. How can one do this WITHOUT having to completely rewrite what the default EdgeRenderingFunction->Automatic option does; that is, I still want the arrows with their heads in the default position (it looks something like 2/3 the way along each arrow). -- Murray Eisenberg murray at math.umass.edu Mathematics & Statistics Dept. Lederle Graduate Research Tower phone 413 549-1020 (H) University of Massachusetts 413 545-2859 (W) 710 North Pleasant Street fax 413 545-1801 Amherst, MA 01003-9305