freq function

Frequency table

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. methods

## S4 method for signature 'SpatRaster'
freq(x, digits=0, value=NULL, bylayer=TRUE, usenames=FALSE, zones=NULL, wide=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
• zones: SpatRaster or SpatVector to define zones for which the tabulation should be done
• wide: logical. Should the results by "wide" instead of "long"?

Returns

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)