gridweights(X, nx, ny, window=NULL)
quad.objectfor an explanation of quadrature weights and quadrature schemes.
The weights are computed by the ``counting weights'' rule
based on a regular grid of rectangular tiles.
X and (optionally)
window are converted into a
point pattern object. Then the bounding rectangle of the window of
the point pattern is
divided into a regular $nx \times ny$ grid of rectangular tiles.
The weight attached to a point of
X is the area of the tile
in which it lies, divided by the number of points of
X lying in
library(spatstat) Q <- quadscheme(runifpoispp(10)) X <- as.ppp(Q) # data and dummy points together w <- gridweights(X, 10, 10)