# duplicated.ppp

From spatstat v1.17-0
by Adrian Baddeley

##### Determine Duplicated Points in a Spatial Point Pattern

Determines which points in a spatial point pattern are duplicates of previous points, and returns a logical vector.

##### Usage

```
## S3 method for class 'ppp':
duplicated(x, \dots)
```

##### Arguments

- x
- A spatial point pattern
(object of class
`"ppp"`

). - ...
- Ignored.

##### Details

This is a method for the generic function `duplicated`

for
point pattern datasets (of class `"ppp"`

, see `ppp.object`

).

Two points in a point pattern are deemed to be identical if their $x,y$ coordinates are the same, and their marks are also the same (if they carry marks). The Examples section illustrates how it is possible for a point pattern to contain a pair of identical points.

This function determines which points in `x`

duplicate
other points that appeared earlier in the sequence. It
returns a logical vector with entries that are `TRUE`

for duplicated points and `FALSE`

for unique (non-duplicated)
points.

##### Value

- A logical vector of length equal to the number of points in
`x`

.

##### See Also

##### Examples

```
X <- ppp(c(1,1,0.5), c(2,2,1), window=square(3))
duplicated(X)
```

*Documentation reproduced from package spatstat, version 1.17-0, License: GPL (>= 2)*

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