# focalWeight

From raster v2.9-5
by Robert Hijmans

##### Focal weights matrix

Calculate focal ("moving window") weight matrix for use in the `focal`

function. The sum of the values adds up to one.

- Keywords
- spatial

##### Usage

`focalWeight(x, d, type=c('circle', 'Gauss', 'rectangle'))`

##### Arguments

- x
Raster* object

- d
numeric. If

`type=circle`

, the radius of the circle (in units of the CRS). If`type=rectangle`

the dimension of the rectangle (one or two numbers). If`type=Gauss`

the size of sigma, and optionally another number to determine the size of the matrix returned (default is 3 times sigma)- type
character indicating the type of filter to be returned

##### Value

matrix that can be used in `focal`

##### Examples

```
# NOT RUN {
r <- raster(ncols=36, nrows=18, xmn=0)
# Gaussian filter for square cells
gf <- focalWeight(r, 2, "Gauss")
# }
```

*Documentation reproduced from package raster, version 2.9-5, License: GPL (>= 3)*

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