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In converting some older code: ## builds an OWIN to generate a set of points on a grid within the OWIN object: bdry <- read.shape( "../../data/boundary.shp" ) outline.verts <- bdry$Shapes[[2]]$verts[1:bdry$Shapes[[2]]$Pstart[2],] outline.order <- nrow( outline.verts ) : 2 bdry.poly <- vector( 2, mode="list" ) bdry.poly[[1]] <- list(

Ok guys, as requested, I will add more info so that you understand why a simple vector operation is not possible. It's not easy to explain in few words but let's see. I have a huge amount of points over a 2D space. I divide my space in a grid with a given resolution,say, 100m. The main loop that I am not sure if it's mandatory or not (any alternative is welcomed) is to go through EACH

Hello list, I need to keep track of objects that are related to particular observations. In this case, I need to keep track of polygons that are associated with observations. What I would ideally have is one column of a dataframe hold a "polygonal" object (from the spatstat package). My question: I seem to have managed to do it, but as I haven't read that dataframes are supposed