ssf: Spatially Sampled Function

In spatstat.core: Core Functionality of the 'spatstat' Family

Spatially Sampled Function

Description

Create an object that represents a spatial function which has been evaluated or sampled at an irregular set of points.

Usage

  ssf(loc, val)

Arguments

loc	The spatial locations at which the function has been evaluated. A point pattern (object of class "ppp").
val	The function values at these locations. A numeric vector with one entry for each point of loc, or a data frame with one row for each point of loc.

Details

An object of class "ssf" represents a real-valued or vector-valued function that has been evaluated or sampled at an irregular set of points. An example would be a spatial covariate that has only been measured at certain locations.

An object of this class also inherits the class "ppp", and is essentially the same as a marked point pattern, except for the class membership which enables it to be handled in a different way.

There are methods for plot, print etc; see plot.ssf and methods.ssf.

Use unmark to extract only the point locations, and marks.ssf to extract only the function values.

Value

Object of class "ssf".

Author(s)

\adrian

See Also

plot.ssf, methods.ssf, Smooth.ssf, with.ssf, [.ssf.

Examples

  ssf(cells, nndist(cells, k=1:3))

spatstat.core documentation built on May 18, 2022, 9:05 a.m.