bdist.points
Distance to Boundary of Window
Computes the distances from each point of a point pattern to the boundary of the window.
Usage
bdist.points(X)Arguments
- X
A point pattern (object of class
"ppp").
Details
This function computes, for each point \(x_i\)
in the point pattern X, the shortest distance
\(d(x_i, W^c)\) from \(x_i\)
to the boundary of the window \(W\) of observation.
If the window Window(X) is of type "rectangle"
or "polygonal", then these distances are computed by
analytic geometry and are exact, up to rounding errors.
If the window is of type "mask" then the distances
are computed using the real-valued distance transform,
which is an approximation with maximum error equal to the width
of one pixel in the mask.
Value
A numeric vector, giving the distances from each point of the pattern to the boundary of the window.
See Also
Examples
# NOT RUN {
data(cells)
d <- bdist.points(cells)
# }