whether to apply the first (1) or second (2) derivative to preprocess the data before the algorithm is applied. Default NULL (It tells the program to not derivate).
# NOT RUN {x <- tile_read(base::system.file("extdata/tile.bsp", package = "uFTIR"))
x <- tile_base_corr(x)
x <- wavealign(x, primpke)
x <- tile_sam(x)
# }