shift.ppp

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Apply Vector Translation To Point Pattern

Applies a vector shift to a point pattern.

Keywords
manip, spatial
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.

shift, shift.owin, rotate, affine

• shift.ppp
Examples
data(cells)
X <- shift(cells, c(2,3))
plot(X)
# no discernible difference except coordinates are different
plot(cells, pch=16)
shift(cells, origin="mid")