Apply Vector Translation To Point Pattern
Applies a vector shift to a point pattern.
## S3 method for class 'ppp' shift(X, vec=c(0,0), ..., origin=NULL)
X |
Point pattern (object of class |
vec |
Vector of length 2 representing a translation. |
... |
Ignored |
origin |
Location that will be shifted to the origin.
Either a numeric vector of length 2 giving the location,
or a point pattern containing only one point,
or a list with two entries named |
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,
the argument vec will be ignored; instead the shift will be performed
so that the specified geometric location is shifted to the
coordinate origin (0,0).
The argument origin should be either a numeric vector of length
2 giving the spatial coordinates of a location, or one of the character
strings "centroid", "midpoint",
"left", "right", "top", "bottom",
"topleft", "bottomleft", "topright" or
"bottomright" (partially matched).
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,
and so on.
Another point pattern (of class "ppp") representing the
result of applying the vector shift.
Adrian Baddeley Adrian.Baddeley@curtin.edu.au
and Rolf Turner r.turner@auckland.ac.nz
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")
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