# Scale values

`scale.Rd`

Center and/or scale raster data. For details see `scale`

## Arguments

- x
SpatRaster

- center
logical or numeric. If

`TRUE`

, centering is done by subtracting the layer means (omitting`NA`

s), and if`FALSE`

, no centering is done. If`center`

is a numeric vector (recycled to`nlyr(x)`

), then each layer of`x`

has the corresponding value from center subtracted from it.- scale
logical or numeric. If

`TRUE`

, scaling is done by dividing the (centered) layers of`x`

by their standard deviations if`center`

is`TRUE`

, and the root mean square otherwise. If scale is`FALSE`

, no scaling is done. If`scale`

is a numeric vector (recycled to`nlyr(x)`

), each layer of`x`

is divided by the corresponding value. Scaling is done after centering.

## Examples

```
r <- rast(system.file("ex/logo.tif", package="terra"))
s <- scale(r)
## the equivalent, computed in steps
m <- global(r, "mean")
rr <- r - m[,1]
rms <- global(rr, "rms")
ss <- rr / rms[,1]
```