Extract Subset of Influence Object
Extract a subset of an influence object, or extract the influence values at specified locations.
## S3 method for class 'influence.ppm': [(x, i, ...)
An object of class
"influence.ppm" contains the values of the
likelihood influence for a point process model, computed by
influence.ppm. This is effectively a marked point
pattern obtained by marking each of the original data points
with its likelihood influence.
This function extracts a designated subset of the influence values,
either as another influence object, or as a vector of numeric values.
[.influence.ppm is a method for
[ for the
"influence.ppm". The argument
i should be
an index applicable to a point pattern. It may be either
a spatial window (object of class
or a sequence index.
The result will be another influence object
To extract the influence values as a numeric vector,
- Another object of class
fit <- ppm(cells, ~x) infl <- influence(fit) b <- owin(c(0.1, 0.3), c(0.2, 0.4)) infl[b] infl[1:5] marks(as.ppp(infl))[1:3]