%DEFINE_CONSTANTS  Defines useful constants for indexing data, etc.
%
%   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. It also
%   defines constants for the change tables used by apply_changes().
%
%   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
%
%   change tables:
%       CT_LABEL, CT_PROB, CT_TABLE, CT_TBUS, CT_TGEN, CT_TBRCH, CT_TAREABUS,
%       CT_TAREAGEN, CT_TAREABRCH, CT_ROW, CT_COL, CT_CHGTYPE, CT_REP,
%       CT_REL, CT_ADD, CT_NEWVAL, CT_TLOAD, CT_TAREALOAD, CT_LOAD_ALL_PQ,
%       CT_LOAD_FIX_PQ, CT_LOAD_DIS_PQ, CT_LOAD_ALL_P, CT_LOAD_FIX_P,
%       CT_LOAD_DIS_P, CT_TGENCOST, CT_TAREAGENCOST, CT_MODCOST_F,
%       CT_MODCOST_X
%
%   See CASEFORMAT, IDX_BUS, IDX_BRCH, IDX_GEN, IDX_COST and IDX_CT for
%   details on the meaning of these constants. Internally
%   DEFINE_CONSTANTS calls IDX_BUS, IDX_BRCH, IDX_GEN, IDX_COST and IDX_CT.
%   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
%   Copyright (c) 2009-2016 by Power System Engineering Research Center (PSERC)
%   by Doug Mitarotonda & Ray Zimmerman, PSERC Cornell
%
%   This file is part of MATPOWER.
%   Covered by the 3-clause BSD License (see LICENSE file for details).
%   See http://www.pserc.cornell.edu/matpower/ for more info.

%% 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;
[CT_LABEL, CT_PROB, CT_TABLE, CT_TBUS, CT_TGEN, CT_TBRCH, CT_TAREABUS, ...
    CT_TAREAGEN, CT_TAREABRCH, CT_ROW, CT_COL, CT_CHGTYPE, CT_REP, ...
    CT_REL, CT_ADD, CT_NEWVAL, CT_TLOAD, CT_TAREALOAD, CT_LOAD_ALL_PQ, ...
    CT_LOAD_FIX_PQ, CT_LOAD_DIS_PQ, CT_LOAD_ALL_P, CT_LOAD_FIX_P, ...
    CT_LOAD_DIS_P, CT_TGENCOST, CT_TAREAGENCOST, CT_MODCOST_F, ...
    CT_MODCOST_X] = idx_ct;