Hi there, Is there a function in R that can draw vector density plot? The vector density plot example can be found here: http://reference.wolfram.com/mathematica/ref/VectorDensityPlot.html As for the vector field plot, I found a function that has been posted in this mailing list: https://stat.ethz.ch/pipermail/r-help/2007-November/147005.html I also referred to rasterVis package for the vectorplot function. However, I don't figure out how to plot for field (-y, x) or something like that. Any help will be really appreciated. Best, Jinsong