# shift.ppp

From spatstat v1.21-0
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")
```

*Documentation reproduced from package spatstat, version 1.21-0, License: GPL (>= 2)*

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