freq function

Frequency table

Frequency table of the values of a RasterLayer. methods

## 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)

Returns

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)