Extract Subset of Leverage Object
Extract a subset of a leverage map, or extract the leverage values at specified locations.
## S3 method for class 'leverage.ppm': [(x, i, ...)
An object of class
"leverage.ppm" contains the values of the
leverage function for a point process model, computed by
This function extracts a designated subset of the leverage values, either as another leverage object, or as a vector of numeric values.
[.leverage.ppm is a method for
[ for the
"leverage.ppm". The argument
i should be either
- a spatial window (object of class
"owin") determining a region where the leverage map is required. The result will typically be another leverage map (object of class
- a spatial point pattern (object of class
"ppp") specifying locations at which the leverage values are required. The result will be a numeric vector.
[.im, is applied to the leverage map. If this yields a pixel image, then the result of
[.leverage.ppmis another leverage object. Otherwise, a vector containing the numeric values of leverage is returned.
- Another object of class
"leverage.ppm", or a vector of numeric values of leverage.
fit <- ppm(cells, ~x) lev <- leverage(fit) b <- owin(c(0.1, 0.3), c(0.2, 0.4)) lev[b] lev[cells]