Greeting foot people.
I was creating a external function to create a normal distributed
source signal, but i found myself in a little problem, look at this:
f.c:
#include <stdlib.h>
double f(void)
{
return random();
}
f.h:
double f(void);
f.mo:
function f
output Real y;
external
annotation(Library="/tmp/f.o", Include="#include \"/tmp/f.h\"");
end f;
class A
Real x;
initial equation
x = 20;
equation
der(x) = -x;
end A;
class B
Real x;
Real y;
initial equation
x = 20;
equation
der(x) = -x;
y = 0;
end B;
class C
Real x(fixed=false);
Real y;
initial equation
x = 20;
equation
der(x) = -x;
y = 0;
end C;
class D
Real x(fixed=false);
Real y;
initial equation
x = 20;
equation
der(x) = -x;
y = f();
end D;
class E
Real y;
equation
y = f();
end E;
class F
Real x;
Real y;
initial equation
x = 20;
equation
der(x) = -x;
y = f();
end F;
well, copy this to /tmp and in a OMShell-terminal:
[EMAIL PROTECTED]:/tmp$ OMShell-terminal
Open Source Modelica Terminal Shell
Copyright 1997-2007, PELAB, Linkoping University
To get help on using Mosh and OpenModelica, type "help()" and press enter
Started server using:/usr/share/omc-omshell/bin/omc +d=interactive >
/tmp/error.log 2>&1 &
res = 0
>>> loadModel(Modelica)
true
>>> loadFile("/tmp/f.mo")
true
>>> system("gcc -c -o /tmp/f.o /tmp/f.c")
0
>>> simulate(A,timeStop=10)
record
resultFile = "A_res.plt"
end record
>>> plot(x)
true
>>> simulate(B,timeStop=10)
record
resultFile = "B_res.plt"
end record
>>> plot({x,y})
true
>>> simulate(C,timeStop=10)
record
resultFile = "C_res.plt"
end record
>>> plot({x,y})
true
>>> simulate(D,timeStop=10)
record
resultFile = "D_res.plt"
end record
>>> plot({x,y})
true
>>> simulate(E,timeStop=10)
record
resultFile = "E_res.plt"
end record
>>> plot(y)
true
>>> simulate(F,timeStop=10)
record
resultFile = "F_res.plt"
end record
>>> plot({x,y})
true
Well, the class A only has a variable and decrease from 20 to 0,
that's ok. The class B has two variables, one should decrease from 20
to 0 and the other one should be constant on 0, but both of them are
0s. At the class C, i declare the x variable with fixed=false, and
that work great. At class D, i declard that y is the returned value
form f, which return a random number, but the simulation stop silently
without error, but without data. At class E, i had deleted the x
variable, and then the simulation work great and y has random values,
and in class F i declared again the variable, but without fixed and
the simulation works but x is not initialized at 20, so, it is a
constant 0.
I don't know if i just missing something here, what i need is work
with the random generator, and initializa other variables with
"initial equation".
What can i do to deal whit this?
PD: If you need some hands to type some lines of code of OpenModelica,
just say, i will be happy to help with it.
--
Jorge Eduardo Cardona
[EMAIL PROTECTED]
jorgeecardona.blogspot.com
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