# localFun

From raster v2.9-5
by Robert Hijmans

##### Local functions

Local functions for two RasterLayer objects (using a focal neighborhood)

##### Usage

```
# S4 method for RasterLayer,RasterLayer
localFun(x, y, ngb=5, fun, filename='', ...)
```

##### Arguments

- x
RasterLayer or RasterStack/RasterBrick

- y
object of the same class as

`x`

, and with the same number of layers- ngb
integer. rectangular neighbourhood size. Either a single integer or a vector of two integers c(rows, cols), such as c(3,3) to have a 3 x 3 focal window

- fun
function

- filename
character. Output filename (optional)

- ...
additional arguments as for

`writeRaster`

##### Value

RasterLayer

##### Note

The first two arguments that `fun`

needs to accept are vectors representing the local cells of RasterLayer `x`

and `y`

(each of length `ngb * ngb`

). It also must have an ellipsis (`...`

) argument

##### See Also

##### Examples

```
# NOT RUN {
set.seed(0)
b <- stack(system.file("external/rlogo.grd", package="raster"))
x <- flip(b[[2]], 'y') + runif(ncell(b))
y <- b[[1]] + runif(ncell(b))
f <- localFun(x, y, fun=cor)
# }
# NOT RUN {
# local regression:
rfun <- function(x, y, ...) {
m <- lm(y~x)
# return R^2
summary(m)$r.squared
}
ff <- localFun(x, y, fun=rfun)
plot(f, ff)
# }
```

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

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