freq: Frequency table

freqR Documentation

Frequency table

Description

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

Usage

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

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

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).

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)


terra documentation built on Jan. 17, 2023, 5:18 p.m.