terra (version 1.8-5)

freq: Frequency table

Description

Frequency table of the values of a SpatRaster. NAs are not counted unless value=NA.

You can provide a SpatVector or additional SpatRaster to define zones for which to do tabulations.

Usage

# S4 method for SpatRaster
freq(x, digits=0, value=NULL, bylayer=TRUE, usenames=FALSE, zones=NULL, wide=FALSE)

Value

A data.frame with 3 columns (layer, value, count) unless bylayer=FALSE in which case adata.frame with two columns is returned (value, count).

Arguments

x

SpatRaster

digits

integer. Used for rounding the values before tabulation. Ignored if NA

value

numeric. An optional single value to only count the number of cells with that value. This value can be NA

bylayer

logical. If TRUE tabulation is done by layer

usenames

logical. If TRUE layers are identified by their names instead of their numbers Only relevant if bylayer is TRUE

zones

SpatRaster or SpatVector to define zones for which the tabulation should be done

wide

logical. Should the results by "wide" instead of "long"?

Examples

r <- rast(nrows=10, ncols=10)
set.seed(2)
values(r) <- sample(5, ncell(r), replace=TRUE)

freq(r)

x <- c(r, r/3)
freq(x, bylayer=FALSE)
freq(x)

freq(x, digits=1)
freq(x, digits=-1)

freq(x, value=5)