function TorF = isload(gen)%ISLOAD  Checks for dispatchable loads.%   TorF = isload(gen) returns a column vector of 1's and 0's. The 1's%   correspond to rows of the gen matrix which represent dispatchable loads.%   The current test is Pmin < 0 AND Pmax == 0.%   This may need to be revised to allow sensible specification%   of both elastic demand and pumped storage units.%   MATPOWER%   $Id: isload.m,v 1.4 2005/10/14 16:47:40 ray Exp $%   by Ray Zimmerman, PSERC Cornell%   Copyright (c) 2005 by Power System Engineering Research Center (PSERC)%   See http://www.pserc.cornell.edu/matpower/ for more info.[GEN_BUS, PG, QG, QMAX, QMIN, VG, MBASE, GEN_STATUS, PMAX, PMIN, ...    MU_PMAX, MU_PMIN, MU_QMAX, MU_QMIN, PC1, PC2, QC1MIN, QC1MAX, ...    QC2MIN, QC2MAX, RAMP_AGC, RAMP_10, RAMP_30, RAMP_Q, APF] = idx_gen;TorF = gen(:, PMIN) < 0 & gen(:, PMAX) == 0;return;