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Patients and symptoms. Each of a set of N patients can exhibit any number of a set of n symptoms. We express this as an N n matrix S, with S ij = 1...
Patients and symptoms. Each of a set of N patients can exhibit any number of a set of n symptoms. We express this as an N × n matrix S, with Sij = 1 if patient i exhibits symptom j, or 0 otherwise. Give simple English descriptions of the following expressions. Include the dimensions, and describe the entries.
(a) S1.
(b) ST1.
(c) STS.
(d) SST .
(e) IIsi − sjII2, where skT is the kth row of S.