Hi Dieter,
To ensure that we catch all the events at startup
the solver takes a very tiny step. We also save the
values of variables at time 0 to have them for pre(v).
I think this is the cause for double zero time, but
I'm not 100% sure.
Cheers,
Adrian Pop/
dieter wrote:
Hi,
when I'm using the "time" variable with an "if" clause I'm getting
strange date sets. All sets have two rows with zero time, as in the
following:
DataSet: time
0, 0
0, 0
2.220446049250313e-13, 2.220446049250313e-13
0.002, 0.002
0.004, 0.004
0.006, 0.006
0.008, 0.008
0.01, 0.01
0.012, 0.012
...
DataSet: pi.inPort.pressure
0, 8.987170080912859e-71
0, 1.407479094429326e-112
2.220446049250313e-13, -1.002262231102861e-165
0.002, -3.504384971839359e-176
0.004, -5.630042739254032e-176
0.006, -7.755700506668704e-176
...
it looks as if the *input* variable time has changed somehow!
(I'm using svn:3603)
Dieter
------------------------------------------------------------
connector Port
Real pressure;
flow Real flowrate;
end Port;
// // record with innner/outer not possible
// class Fluid "Water is the default"
// parameter Real density = 1;
// parameter Real viscosity = 1;
// end Fluid;
partial model TwoPorts
// outer parameter Fluid fluid;
Port inPort, outPort;
equation
inPort.flowrate + outPort.flowrate = 0;
end TwoPorts;
model Pipe
extends TwoPorts;
parameter Real a = .5;
equation
inPort.pressure = inPort.flowrate * a;
end Pipe;
model Pump
extends TwoPorts;
Real q;
equation
q = time - outPort.pressure - .1;
inPort.flowrate = if q > 0 then q else 0;
end Pump;
model Ambience
Port port;
equation
port.pressure = 0;
end Ambience;
model Test
// inner parameter Fluid fluid;
Pump pu;
Pipe pi;
Ambience am1, am2;
equation
connect( am1.port, pu.inPort);
connect( pu.outPort, pi.inPort);
connect( pi.outPort, am2.port);
end Test;
// simulate( Test)
