id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
1021	Derivative of expressions der(x -y) does not generate correct code.	Adrian Pop	Adrian Pop	"{{{connector ElectricalPin
  Modelica.SIunits.Voltage v;
  flow Modelica.SIunits.Current i;
end ElectricalPin;

model Resistor
  import Modelica.SIunits;
  parameter SIunits.Resistance R = 300;
  ElectricalPin p, n;
equation
  R * p.i = p.v - n.v;
  p.i + n.i = 0;
end Resistor;

/* fix 1
model Capacitor
  import Modelica.SIunits;
  parameter SIunits.Capacitance C = 1e-6;
  ElectricalPin p, n;
  Modelica.SIunits.Voltage v;
equation
  v = p.v - n.v;
  p.i = C * der(v);
  p.i + n.i = 0;
end Capacitor; */

/* fix 2 */
model Capacitor
  import Modelica.SIunits;
  parameter SIunits.Capacitance C = 1e-6;
  ElectricalPin p, n;
equation
  p.i = C * (der(p.v) - der(n.v)); // the problem is here p.i = C * der(p.v - n.v);
  p.i + n.i = 0;
end Capacitor;

model Inductor
  import Modelica.SIunits;
  parameter SIunits.Inductance L = 1e-3;
  ElectricalPin p, n;
equation
  L * der(p.i) = p.v - n.v;
  p.i + n.i = 0;
end Inductor;

model Ground
  ElectricalPin ground;
equation
  ground.v = 0;
end Ground;

model VoltageSource
  import Modelica.SIunits;
  parameter SIunits.Voltage v1=0, v2=1;
  parameter SIunits.Time jump_time=1.0;
  ElectricalPin p, n;
equation
  p.v - n.v = if time > jump_time then v2 else v1;
  p.i + n.i = 0;
end VoltageSource;

model RLC4
  Resistor R1(R = 15);
  Resistor R2(R = 5000);
  Capacitor C1(C = 100e-6);
  Inductor L1(L = 100e-3);
  VoltageSource vs;
  Ground g;
equation
  connect(vs.n, g.ground);
  connect(vs.p, L1.p);
  connect(L1.n, R1.p);
  connect(L1.n, R2.p);
  connect(R1.n, C1.p);
  connect(C1.n, g.ground);
  connect(R2.n, g.ground);
end RLC4;}}}

The problem is with expresion p.i = C * der(p.v - n.v);"	defect	closed	high		Simulation Code Generation		fixed		Adrian Pop Adrian Pop