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 1.7 2010/04/19 14:40:11 ray Exp $
%   by Ray Zimmerman, PSERC Cornell
%   Copyright (c) 2005-2010 by Power System Engineering Research Center (PSERC)
%
%   This file is part of MATPOWER.
%   See http://www.pserc.cornell.edu/matpower/ for more info.
%
%   MATPOWER is free software: you can redistribute it and/or modify
%   it under the terms of the GNU General Public License as published
%   by the Free Software Foundation, either version 3 of the License,
%   or (at your option) any later version.
%
%   MATPOWER is distributed in the hope that it will be useful,
%   but WITHOUT ANY WARRANTY; without even the implied warranty of
%   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
%   GNU General Public License for more details.
%
%   You should have received a copy of the GNU General Public License
%   along with MATPOWER. If not, see <http://www.gnu.org/licenses/>.
%
%   Additional permission under GNU GPL version 3 section 7
%
%   If you modify MATPOWER, or any covered work, to interface with
%   other modules (such as M-files and MEX-files) available in a
%   Matlab (or compatible) environment containing parts covered
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%   you additional permission to convey the resulting work.

[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;
