[R-sig-Geo] classify a raster by unique value

[Alfredo Alessandrini]

Hi,

I've a raster stack with 3 layers.

I need to classify it assigning one class to each unique combination of values.

> unique(as.matrix(data_stack))
           layer_1 layer_2 layer_3
 [1,] 0.2460000000       2    -0.1
 [2,] 0.1845000000       2    -0.1
 [3,] 0.0000000001       2    -0.1
 [4,] 0.0000000001       2     0.0
 [5,] 0.1476000000       2    -0.1


I must obtain a raster stack like this:

> unique(as.matrix(data_stack))
           layer_1 layer_2 layer_3 class
 [1,] 0.2460000000       2    -0.1   1
 [2,] 0.1845000000       2    -0.1   2
 [3,] 0.0000000001       2    -0.1   3
 [4,] 0.0000000001       2     0.0   4
 [5,] 0.1476000000       2    -0.1   5



Thanks in advance,


Alfredo