Get labels of dataset or mapping
LABELS = GETLAB(A)
Returns the labels of the objects in the dataset A or the feature labels assigned by the mapping W.
If A (or W) is neither a dataset nor a mapping, a set of dummy labels is returned, one for each row in A. All these labels have the value NaN.
Note that for datasets and mappings GETLAB() is effectively the same as GETLABELS().