function?[Bbus?Bf?Pbusinj?Pfinj]?=?makeBdc（baseMVA?bus?branch）
%MAKEBDC???Builds?the?B?matrices?and?phase?shift?injections?for?DC?power?flow.
%???[BBUS?BF?PBUSINJ?PFINJ]?=?MAKEBDC（MPC）
%???[BBUS?BF?PBUSINJ?PFINJ]?=?MAKEBDC（baseMVA?BUS?BRANCH）
%
%???Returns?the?B?matrices?and?phase?shift?injection?vectors?needed?for
%???a?DC?power?flow.?The?bus?real?power?injections?are?related?to?bus
%???voltage?angles?by?
%???????P?=?BBUS?*?Va?+?PBUSINJ
%???The?real?power?flows?at?the?from?end?the?lines?are?related?to?the?bus
%???voltage?angles?by
%???????Pf?=?BF?*?Va?+?PFINJ
%???Does?appropriate?conversions?to?p.u.
%???Bus?numbers?must?be?consecutive?beginning?at?1?（i.e.?internal?ordering）.
%


%???Example:
%???????[Bbus?Bf?Pbusinj?Pfinj]?=?makeBdc（baseMVA?bus?branch）;
%
%???See?also?DCPF.

%???MATPOWER
%???Copyright?（c）?1996-2016?Power?Systems?Engineering?Research?Center?（PSERC）
%???by?Carlos?E.?Murillo-Sanchez?PSERC?Cornell?&?Universidad?Nacional?de?Colombia
%???and?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.

%%?extract?from?MPC?if?necessary
if?nargin?????mpc?????=?baseMVA;
????baseMVA?=?mpc.baseMVA;
????bus?????=?mpc.bus;
????branch??=?mpc.branch;
end

%%?constants
nb?=?size（bus?1）;??????????%%?number?of?buses
nl?=?size（branch?1）;???????%%?number?of?lines

%%?define?named?indices?into?bus?branch?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?~?QT?MU_SF?MU_ST?...
????ANGMIN?ANGMAX?MU_ANGMIN?MU_ANGMAX]