search for: p1t1

Howdo folks, So my data is in this sort of format: P T I 1 1 (1, 2, 3) 2 1 (2, 4) 1 2 (1, 3, 6, 7) 2 2 (6) And I want to be able to quickly get: 1: The I when both P and T are given. e.g.: P = 2, T = 2; I = (6) 2: The concatenated vector of Is when P and a subset of T is given, e.g.: P = 1, T = 1:2; Is = (1, 2, 3, 1, 3, 6, 7) 3: The length of that vector. It would also be nice to