num argument of a Carto3D or a MRIaggr method. For internal use.
"initNum"(object, num, test = TRUE, init = TRUE, method)
"initNum"(object, num, test = TRUE, init = TRUE, slice_var = "k", method)Carto3D or MRIaggr.NULL. See the details section.num equals NULL ? logical. "i" for sagittal, "j" for coronal and "k" for transverse. character.num to NULL leads to load all available slices.