I've alreade read about the in operator and that it's not yet implied in OM.

Now I've tried to simulate the HeatDiffusion1D example in OMNotebook but always get an error when i write down th package DifferentialOperators1D.
The error is: missing token: RPAR

Here is my example Code:

package DifferentialOperators1D "Finite Difference differential operators"

  

  function pder "Returns vector of spatial derivative values of a 1D field"

    input Fields.Field1D f;

    input Integer x=1 "Diff order - first or second derivative";

    output Real df[size(f.val;1)];

  algorithm

    df := if x == 1 then SecondOrder.diff1(f.val, f.domain.dx)

    else SecondOrder.diff2(f.val, f.domain.dx);

  end pder;



  package FirstOrder "First order polynomial derivative approximations"

  

    function diff1 "First derivative"

      input Real u[:];

      input Real dx;

      output Real du[size(u,1)];        

    algorithm         // Left, central,  and right differences

      du := cat(1, {(u[2] - u[1])/dx}, (u[3:end] - u[1:end-2])/2/dx,

                   {(u[end] - u[end-1])/dx});

    end diff1;

  end FirstOrder;  

      

  package SecondOrder "Second order polynomial derivative approximations"

  

    function diff1 "First derivative"

      input Real u[:];

      input Real dx;

      output Real du[size(u,1)];

    algorithm

      du := cat(1, {(-3*u[1] + 4*u[2] - u[3])/2/dx },

                   {u[3:end] - u[1:end-2])/2/dx,

                   {(3*u[end] - 4*u[end-1] + u[end-2])/2/dx} );

    end diff1;

    

    function diff2 "Second derivative"

      input Real u[:];

      input Real dx;

      output Real du2[size(u,1)];

    algorithm

      du2 := cat(1, {(2*u[1] - 5*u[2] + 4*u[3] - u[4])/dx/dx },

                    (u[3:end] - 2*u[2:end-1] + u[1:end-2])/dx/dx,

                    {(2*u[end] - 5*u[end-1] + 4*u[end-2] - u[end-3])/dx/dx} );

    end diff2;

  end SecondOrder;

end DifferentialOperators1D;

Thanks for your help!

Hi all!

I simulated a Spring-Damper-System in OMEdit 1.8 by simulating gravity with force and then again with the MultiBody icon world. I compared the results to the same mathematical model in Matlab/Simulink. The one model with my simulated force (9.81N touching) got the same result, but the MultiBody model didn't.
Does anybody know why??

My values for the spring-damper system:

m =1;
k=10;
b=1;
g=9.81;


Thanks for your help!!

Regards

Hello again!

I've only got one remaining problem! Where can I find which parameter in my matrix in matlab/simulink is which parameter in modelica? is there any lining up?
and anther one: my x axis has a wrong scale.
when i simulate for 20 secondes in omedit, in matlab the omedit simulation seems to simulate for 200 seconds. matlab file and omedit file don't fit....
anybody knows these problems?
Thanks!

Hi!

I just wanted to install ModelicaML using Eclipse Helios, but couldn't.
Every Time when I come to the step where ModelicaML is installed in Eclipse, I get an error, because "one or more required items could not be found."

Can anybody help me?

Regards

Many Thanks! I looked for this since weeks now! Thank you!!

Hi!

I wanted to simulate the fullRobot and oneAxis Model from the library.
After half an hour of compiling and simulating, I came to the Plotting Area for the oneAxis Model, but there wasn't anything to select and plot..
Then I tried to simulate the fullRobot Model, but after nearly an hour of compiling and simulating I cancelled it with no output at all...
Took simply too long.
Anyone with the same probloms or can anyone help me?

I'm using OMEdit 1.8

Thanks, Fabian

Hi!

I wanted to compare the models I have created in OMEdit to my models created in Matlab/Simulink!

When I simulate in OMEdit I can choose an Output Format and an (optional) File Name! But where is this file saved, so I can load it into Matlab/Simulink?

Is there another possability??

Thanks, cheers, Fabian