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, ..., update=TRUE]
x |
A leverage object (of class |
i |
Subset index (passed to |
... |
Further arguments passed to |
update |
Logical value indicating whether to update the internally-stored value of the mean leverage, by averaging over the specified subset. |
An object of class "leverage.ppm" contains the values of the
leverage function for a point process model, computed by
leverage.ppm.
This function extracts a designated subset of the leverage values, either as another leverage object, or as a vector of numeric values.
The function [.leverage.ppm is a method for [ for the
class "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 leverage.ppm).
a spatial point pattern (object of class "ppp")
specifying locations at which the leverage values are required.
The result will be a numeric vector.
The subset operator for images, [.im, is applied to
the leverage map. If this yields a pixel image, then the result of
[.leverage.ppm is 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.
Adrian Baddeley Adrian.Baddeley@curtin.edu.au, Rolf Turner r.turner@auckland.ac.nz and Ege Rubak rubak@math.aau.dk
fit <- ppm(cells ~x) lev <- leverage(fit) b <- owin(c(0.1, 0.3), c(0.2, 0.4)) lev[b] lev[cells]
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