Applies a vector shift to a point pattern.

```
# S3 method for ppp
shift(X, vec=c(0,0), …, origin=NULL)
```

X

Point pattern (object of class `"ppp"`

).

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 `x`

and `y`

,
or one of the character strings
`"centroid"`

, `"midpoint"`

,
`"left"`

, `"right"`

, `"top"`

, `"bottom"`

,
`"topleft"`

, `"bottomleft"`

, `"topright"`

or
`"bottomright"`

(partially matched).

Another point pattern (of class `"ppp"`

) representing the
result of applying the vector shift.

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.

# NOT RUN { 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") # }