freq: Frequency table

In raster: Geographic Data Analysis and Modeling

Frequency table

Description

Frequency table of the values of a RasterLayer.

Usage

## S4 method for signature 'RasterLayer'
freq(x, digits=0, value=NULL, useNA='ifany', progress='', ...)

## S4 method for signature 'RasterStackBrick'
freq(x, digits=0, value=NULL, useNA='ifany', merge=FALSE, progress='', ...)

Arguments

x	RasterLayer
digits	non-negative integer for rounding the cell values. Argument is passed to round
value	numeric, logical or NA. An optional single value to only count the number of cells with that value
useNA	character. What to do with NA values? Options are "no", "ifany", "always". See to table
progress	character to specify a progress bar. Choose from 'text', 'window', or ” (the default, no progress bar)
merge	logical. If TRUE the list will be merged into a single data.frame
...	additional arguments (none implemented)

Value

matrix (RasterLayer). List of matrices (one for each layer) or data.frame (if merge=TRUE) (RasterStack or RasterBrick)

See Also

crosstab and zonal

Examples

r <- raster(nrow=18, ncol=36)
values(r) <- runif(ncell(r))
r[1:5] <- NA
r <- r * r * r * 5
freq(r)

freq(r, value=2)

s <- stack(r, r*2, r*3)
freq(s, merge=TRUE)

raster documentation built on Oct. 3, 2024, 1:08 a.m.