[R-sig-Geo] Crossing multiple raster to obtain a list of available values for each cell - LULCC package

[David García Álvarez]

Dear list,

I want to cross multiple rasters with the same spatial resolution and 
extent and obtain as a result a summary raster or table that tells me 
which are the values that each cell acquires in the different rasters. 
That is, if I cross three rasters of one cell, with values 0, 1, 0, I 
would like to obtain a result that would tell me that the values of that 
cell are: 0, 1, 0.

I have checked that the crosstab function of the raster packages allows 
to cross multiple rasters (by using a rasterstack). However, I do not 
know how to obtain the result I explained above.

The LULCC package includes different functions to do that. However, in 
my experience, it is not really efficient and does not work well for 
rasters that are not very simple. The basic function of the package 
(Threemapcomparison) did not work for me or took for ages to run.

Therefore, I would like to ask the community for help about: 1. ways to 
do the operation I described above, 2. to effectively work with the 
LULCC package in case I am doing something wrong or my issues with 
processing time / errors are not normal.

Best,
David