Generate a sparse_pk object
as_sparse_pk(conc, time, subject)A sparse_pk object which is a list of lists. The inner lists have elements named: "time", The time of measurement; "conc", The concentration measured; "subject", The subject identifiers. The object will usually be modified by future functions to add more named elements to the inner list.
Concentration measurements (must be numeric, finite, and not NA)
Time of concentration measurements (must be numeric, finite, and not NA)
Subject identifiers (may be any class; may not be null)
Other Sparse Methods:
pk.calc.sparse_auc(),
sparse_auc_weight_linear(),
sparse_mean()