I want to plot a vector field F={Fx, Fy, Fz}. However, I only want to plot it in one plane (say, z=0).
When I use VectorPlot3D[{Fx, Fy, Fz}, {x, -1, 1}, {y, -1, 1}, {z, 0, x}], and x=0, I get
VectorPlot3D::plld: "Endpoints for z in {z,0,0} must have distinct machine-precision numerical values."
and when x=0.1, it gives me several layers of vectors, which I do not want.
So the question is: How can I plot a 3D-Vector-Field only in a 2-dimensional plane?
Thanks!!
VectorPlot3D[{x, y, z}, {x, -1, 1}, {y, -1, 1}, {z, -1, 1}] 
Now you can either use ViewPoint
VectorPlot3D[{x, y, z}, {x, -1, 1}, {y, -1, 1}, {z, -1, 1}, ViewPoint -> {0, 0, 200}] 
or define a very small z-range
VectorPlot3D[{x, y, z}, {x, -1, 1}, {y, -1, 1}, {z, -0.001, 0.001}] 
Grid[{ VectorPlot3D[{x, y, z}, {x, -1, 1}, {y, -1, 1}, {z, ##}, VectorColorFunction -> "ThermometerColors", PlotTheme -> "Marketing", ImageSize -> 300] & @@@ {{-0.2, -0.199}, {-0.001, 0.001}, {0.199, 0.2}} }] 
If you dare and have V10 you could also use ClipPlanes:
VectorPlot3D[{x, y, z}, {x, -1, 1}, {y, -1, 1}, {z, -1, 1}, VectorColorFunction -> "Rainbow", VectorStyle -> "Arrow3D", PlotTheme -> "Marketing", ImageSize -> 600, ClipPlanes -> {{0, 0, -10, -5}}] 
