shift.ppp
From spatstat v1.16-3
by Adrian Baddeley
Apply Vector Translation To Point Pattern
Applies a vector shift to a point pattern.
Usage
## S3 method for class 'ppp':
shift(X, vec=c(0,0), ..., origin=NULL)
Arguments
- X
- Point pattern (object of class
"ppp"
). - vec
- Vector of length 2 representing a translation.
- ...
- Ignored
- origin
- Character string determining a location
that will be shifted to the origin. Options are
"centroid"
,"midpoint"
and"bottomleft"
. Partially matched.
Details
The point pattern, and its window, are
translated by the vector vec
.
This is a method for the generic function shift
.
If origin
is given, then it should be one of the character
strings "centroid"
, "midpoint"
or "bottomleft"
.
The argument vec
will be ignored; instead the shift will be performed
so that the specified geometric location is shifted to the origin.
If origin="centroid"
then the centroid of the window will be
shifted to the origin. If origin="midpoint"
then the centre of
the bounding rectangle of the window will be shifted to the origin.
If origin="bottomleft"
then the bottom left corner of the
bounding rectangle of the window will be shifted to the origin.
Value
- Another point pattern (of class
"ppp"
) representing the result of applying the vector shift.
See Also
Examples
data(cells)
X <- shift(cells, c(2,3))
plot(X)
# no discernible difference except coordinates are different
plot(cells, pch=16)
plot(shift(cells, c(0.03,0.03)), add=TRUE)
shift(cells, origin="mid")
Community examples
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