//IDX_DCLINE   Defines constants for named column indices to dcline matrix.
//   Example:
//
//   c = idx_dcline;
//
//   Some examples of usage, after defining the constants using the line above,
//   are:
//
//    mpc.dcline(4, c.BR_STATUS) = 0;        % take dcline 4 out of service
// 
//   The index, name and meaning of each column of the dcline matrix is given
//   below:
//
//   columns 1-17 must be included in input matrix (in case file)
//    1  F_BUS     f, "from" bus number
//    2  T_BUS     t,  "to"  bus number
//    3  BR_STATUS initial dcline status, 1 - in service, 0 - out of service
//    4  PF        MW flow at "from" bus ("from" -> "to")
//    5  PT        MW flow at  "to"  bus ("from" -> "to")
//    6  QF        MVAr injection at "from" bus ("from" -> "to")
//    7  QT        MVAr injection at  "to"  bus ("from" -> "to")
//    8  VF        voltage setpoint at "from" bus (p.u.)
//    9  VT        voltage setpoint at  "to"  bus (p.u.)
//   10  PMIN      lower limit on PF (MW flow at "from" end)
//   11  PMAX      upper limit on PF (MW flow at "from" end)
//   12  QMINF     lower limit on MVAr injection at "from" bus
//   13  QMAXF     upper limit on MVAr injection at "from" bus
//   14  QMINT     lower limit on MVAr injection at  "to"  bus
//   15  QMAXT     upper limit on MVAr injection at  "to"  bus
//   16  LOSS0     constant term of linear loss function (MW)
//   17  LOSS1     linear term of linear loss function (MW/MW)
//                 (loss = LOSS0 + LOSS1 * PF)
//
//   columns 18-23 are added to matrix after OPF solution
//   they are typically not present in the input matrix
//                 (assume OPF objective function has units, u)
//   18  MU_PMIN   Kuhn-Tucker multiplier on lower flow lim at "from" bus (u/MW)
//   19  MU_PMAX   Kuhn-Tucker multiplier on upper flow lim at "from" bus (u/MW)
//   20  MU_QMINF  Kuhn-Tucker multiplier on lower VAr lim at "from" bus (u/MVAr)
//   21  MU_QMAXF  Kuhn-Tucker multiplier on upper VAr lim at "from" bus (u/MVAr)
//   22  MU_QMINT  Kuhn-Tucker multiplier on lower VAr lim at  "to"  bus (u/MVAr)
//   23  MU_QMAXT  Kuhn-Tucker multiplier on upper VAr lim at  "to"  bus (u/MVAr)
//
//   See also TOGGLE_DCLINE.

//   MATPOWER
//   Copyright (c) 2011-2016, Power Systems Engineering Research Center (PSERC)
//   by Ray Zimmerman, PSERC Cornell
//
//   This file is part of MATPOWER.
//   Covered by the 3-clause BSD License (see LICENSE file for details).
//   See https://matpower.org for more info.

// define the indices
c = struct( ...
    'F_BUS',     1, ... // f, "from" bus number
    'T_BUS',     2, ... // t,  "to"  bus number
    'BR_STATUS', 3, ... // initial dcline status, 1 - in service, 0 - out of service
    'PF',        4, ... // MW flow at "from" bus ("from" -> "to")
    'PT',        5, ... // MW flow at  "to"  bus ("from" -> "to")
    'QF',        6, ... // MVAr injection at "from" bus ("from" -> "to")
    'QT',        7, ... // MVAr injection at  "to"  bus ("from" -> "to")
    'VF',        8, ... // voltage setpoint at "from" bus (p.u.)
    'VT',        9, ... // voltage setpoint at  "to"  bus (p.u.)
    'PMIN',     10, ... // lower limit on PF (MW flow at "from" end)
    'PMAX',     11, ... // upper limit on PF (MW flow at "from" end)
    'QMINF',    12, ... // lower limit on MVAr injection at "from" bus
    'QMAXF',    13, ... // upper limit on MVAr injection at "from" bus
    'QMINT',    14, ... // lower limit on MVAr injection at  "to"  bus
    'QMAXT',    15, ... // upper limit on MVAr injection at  "to"  bus
    'LOSS0',    16, ... // constant term of linear loss function (MW)
    'LOSS1',    17, ... // linear term of linear loss function (MW)
    'MU_PMIN',  18, ... // Kuhn-Tucker multiplier on lower flow lim at "from" bus (u/MW)
    'MU_PMAX',  19, ... // Kuhn-Tucker multiplier on upper flow lim at "from" bus (u/MW)
    'MU_QMINF', 20, ... // Kuhn-Tucker multiplier on lower VAr lim at "from" bus (u/MVAr)
    'MU_QMAXF', 21, ... // Kuhn-Tucker multiplier on upper VAr lim at "from" bus (u/MVAr)
    'MU_QMINT', 22, ... // Kuhn-Tucker multiplier on lower VAr lim at  "to"  bus (u/MVAr)
    'MU_QMAXT', 23  );  // Kuhn-Tucker multiplier on upper VAr lim at  "to"  bus (u/MVAr)
