To get the loadings of the external variables regarding the latent variable in each cluster Applies only when external variables (Xr, Xu or both) are involved.
get_load(resclv, K = NULL): result of CLV(), CLV_kmeans() or LCLV()
: the number of groups chosen (already defined if CLV_kmeans is used
the loadings of the external variables For results of LCLV, two types of ladings are defined : loading_v : loadings of the external Xr variables, loading_u : loadings of the external Xu variables.