# shift.ppp

##### Apply Vector Translation To Point Pattern

Applies a vector shift to a point pattern.

##### Usage

```
# S3 method for 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
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).

##### 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,
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.

##### Value

Another point pattern (of class `"ppp"`

) representing the
result of applying the vector shift.

##### See Also

##### Examples

```
# NOT RUN {
data(cells)
X <- shift(cells, c(2,3))
# }
# NOT RUN {
plot(X)
# no discernible difference except coordinates are different
# }
# NOT RUN {
plot(cells, pch=16)
plot(shift(cells, c(0.03,0.03)), add=TRUE)
shift(cells, origin="mid")
# }
```

*Documentation reproduced from package spatstat, version 1.61-0, License: GPL (>= 2)*