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( x=outline.verts[outline.order,1],
y=outline.verts[outline.order,2] )
bdry.poly[[2]] <- list(
x=bdry$Shapes[[1]]$verts[1:(nrow(bdry$Shapes[[1]]$verts)-1),1],
y=bdry$Shapes[[1]]$verts[1:(nrow(bdry$Shapes[[1]]$verts)-1),2] )
bdry.owin <- owin( poly=bdry.poly )
grid <- gridcentres( bdry.owin, 200, 200 )
I've run across the following problem where I now need to use the readShapePoly
function in the sp package:
bdry2 <- readShapePoly( "../../data/boundary.shp" )
which requires the elements be accessed using the slot function?
My question, after trying to find the answer on-line and in some docs, is how?
Help?
Also, I'm not sure I get the r-help digests, so if someone can shed light on
the subject, can you please respond directly?
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