Computes the distances from each point of a point pattern to the boundary of the window.
bdist.points(X)
A point pattern (object of class "ppp"
).
A numeric vector, giving the distances from each point of the pattern to the boundary of the window.
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.
# NOT RUN { data(cells) d <- bdist.points(cells) # }