bdist.points
From spatstat v1.19-2
by Adrian Baddeley
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 X$window
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
data(cells)
d <- bdist.points(cells)
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