raster (version 2.5-8)

cv: Coefficient of variation

Description

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.

Usage

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

# NOT RUN {
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)
# }