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    %DEFINE_CONSTANTS  Defines constants for named column indices to data matrices.
%
%   This is simply a convenience script that defines the constants
%   listed below, consisting primarily of named indices for the
%   columns of the data matrices: bus, branch, gen and gencost.
%   This includes input columns defined in caseformat as well as
%   columns that are added in the power flow and OPF output.
%
%   bus:
%      PQ, PV, REF, NONE, BUS_I, BUS_TYPE, PD, QD, GS, BS, BUS_AREA, VM,
%      VA, BASE_KV, ZONE, VMAX, VMIN, LAM_P, LAM_Q, MU_VMAX, MU_VMIN
%
%   branch:
%      F_BUS, T_BUS, BR_R, BR_X, BR_B, RATE_A, RATE_B, RATE_C,
%      TAP, SHIFT, BR_STATUS, PF, QF, PT, QT, MU_SF, MU_ST,
%      ANGMIN, ANGMAX, MU_ANGMIN, MU_ANGMAX
%
%   gen:
%      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
%
%   gencost: 
%      PW_LINEAR, POLYNOMIAL, MODEL, STARTUP, SHUTDOWN, NCOST, COST
%
%   See CASEFORMAT, IDX_BUS, IDX_BRCH, IDX_GEN and IDX_COST for
%   details on the meaning of these constants. Internally
%   DEFINE_CONSTANTS calls IDX_BUS, IDX_BRCH, IDX_GEN and IDX_COST.
%   In performance sensitive code, such as internal MATPOWER functions
%   that are called frequently, it is preferred to call these
%   functions directly rather than using the DEFINE_CONSTANTS script,
%   which is less efficient.
%
%   This script is included for convenience for interactive use or
%   for high-level code where maximum performance is not a concern.

%   MATPOWER
%   $Id: define_constants.m,v 1.9 2011/12/01 19:06:47 cvs Exp $
%   by Doug Mitarotonda & Ray Zimmerman, PSERC Cornell
%   Copyright (c) 2009-2010 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 MATLAB code and MEX-files) available in a
%   MATLAB(R) or comparable environment containing parts covered
%   under other licensing terms, the licensors of MATPOWER grant
%   you additional permission to convey the resulting work.

%% define named indices into data matrices
[PQ, PV, REF, NONE, BUS_I, BUS_TYPE, PD, QD, GS, BS, BUS_AREA, VM, ...
    VA, BASE_KV, ZONE, VMAX, VMIN, LAM_P, LAM_Q, MU_VMAX, MU_VMIN] = idx_bus;
[F_BUS, T_BUS, BR_R, BR_X, BR_B, RATE_A, RATE_B, RATE_C, ...
    TAP, SHIFT, BR_STATUS, PF, QF, PT, QT, MU_SF, MU_ST, ...
    ANGMIN, ANGMAX, MU_ANGMIN, MU_ANGMAX] = idx_brch;
[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;
[PW_LINEAR, POLYNOMIAL, MODEL, STARTUP, SHUTDOWN, NCOST, COST] = idx_cost;