Compute the coefficient of variation (expressed as a percentage). If there is only a single value, `sd`

is `NA`

and `cv`

returns `NA`

if `aszero=FALSE`

(the default). However, if (`aszero=TRUE`

), `cv`

returns `0`

.

```
# S4 method for class 'ANY'
cv(x, ..., aszero=FALSE, na.rm = FALSE)
# S4 method for class 'Raster'
cv(x, ..., aszero=FALSE, na.rm = FALSE)
```

## Arguments

- x
A vector of numbers (typically integers for modal), or a Raster* object

- ...
additional (vectors of) numbers, or Raster objects

- aszero
logical. If `TRUE`

, a zero is returned (rather than an NA) if the cv of single value is computed

- na.rm
Remove (ignore) NA values

## Value

vector or RasterLayer

## Examples

```
data <- c(0,1,2,3,3,3,3,4,4,4,5,5,6,7,7,8,9,NA)
cv(data, na.rm=TRUE)
#> [1] 56.23757
```