# areadiff

From spatstat v1.12-8
by Adrian Baddeley

##### Difference of Disc Areas

Computes the area of that part of a disc that is not covered by other discs.

##### Usage

`areadiff(u, X, r, ngrid=256)`

##### Arguments

- u
- Coordinates of the centre of the disc. A vector of length 2.
- X
- Locations of the centres of other discs.
A point pattern (object of class
`"ppp"`

). - r
- Disc radius.
- ngrid
- Dimensions of the
`ngrid * ngrid`

array of test points that will be used to estimate the uncovered area.

##### Details

This function computes the area of that part of
the disc of radius `r`

centred at the location `u`

that is *not* covered by any of the discs of radius `r`

centred at the points of the pattern `X`

.

##### Value

- A single number (the uncovered area)

##### See Also

##### Examples

```
data(cells)
u <- c(0.5,0.5)
areadiff(u, cells, 0.1)
```

*Documentation reproduced from package spatstat, version 1.12-8, License: GPL (>= 2)*

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