Extract.leverage.ppm
From spatstat v1.41-1
by Adrian Baddeley
Extract Subset of Leverage Object
Extract a subset of a leverage map, or extract the leverage values at specified locations.
Usage
## S3 method for class 'leverage.ppm':
[(x, i, ...)
Arguments
- x
- A leverage object (of class
"leverage.ppm"
) computed byleverage.ppm
. - i
- Subset index (passed to
[.im
). Either a spatial window (object of class"owin"
) or a spatial point pattern (object of class"ppp"
). - ...
- Further arguments passed to
[.im
, especially the argumentdrop
.
Details
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 classleverage.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.
[.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.
Value
- Another object of class
"leverage.ppm"
, or a vector of numeric values of leverage.
See Also
Examples
fit <- ppm(cells, ~x)
lev <- leverage(fit)
b <- owin(c(0.1, 0.3), c(0.2, 0.4))
lev[b]
lev[cells]
Community examples
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