freq: Frequency table
In raster: Geographic Data Analysis and Modeling

Description Usage Arguments Value See Also Examples

Frequency table of the values of a RasterLayer.

## 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='', ...)

`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)

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

crosstab and zonal

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)

Loading required package: sp
     value count
[1,]     0   288
[2,]     1   143
[3,]     2    82
[4,]     3    64
[5,]     4    42
[6,]     5    24
[7,]    NA     5
[1] 82
   value layer.1 layer.2 layer.3
1      0     288     244     221
2      1     143      83      67
3      2      82      74      53
4      3      64      58      53
5      4      42      42      37
6      5      24      28      36
7      6      NA      33      29
8      7      NA      24      17
9      8      NA      26      19
10     9      NA      18      24
11    10      NA      13      21
12    11      NA      NA      14
13    12      NA      NA      11
14    13      NA      NA      17
15    14      NA      NA      12
16    15      NA      NA      12
17    NA       5       5       5