I've basically got the same problem.

I've written a piece of code that seems to check out ok, but once I try to run it through simulate (NameHere) I get an answer that sadly isn't as exhaustive as I'd might had wished for:

record SimulationResult
    resultFile = "Simulation failed.
Error: Error occured while flattening model NameHere
"
end SimulationResult;

I'm guessing that there isn't much to hope for, else than a better error output in the future?

Right, I wouldn't hope for too much either - especially not, if you work on a timeline. The true problem is, that 1.5 final in fact is somthing which normally would be labeled as an early beta release. Maybe it will work better in half a year, maybe in a year, maybe never... who knows.

If you work with Modelica professionally, you could consider commercial environments - They are not cheap, but it pays off. Just my opinion...

Hi,

Well, it takes a while for open-source to reach the state of a commercial software.
I do agree with you that things could be much better, but it takes time to get there.

Unfortunately, looking at your log and not knowing anything about the structure of your model, I can only guess what the problems might be:
- possible wrong within statements (meaning that NNN does not exists and you use it: within NNN;)
- a lot of redeclares which we don't handle very well
- quoted identifiers might be an issue (I have to check if we escape them somehow before we reach C code)

I know that posting your models is not possible if they are private, but any kind of public model that has some error would help.
Alternatives are (if you can) to send models privately to me (or any of our developers) via e-mail [Adrian.Pop@liu.se] and then I
can check what the problems are.

We changed a bit our development strategy lately.
We're now not adding any new functionality, but we focus to fix problems to be able to flatten
as much as possible from Modelica Standard Library 3.1 (which mostly works except Media & Fluid).

Cheers,
Adrian Pop/

Dear all,
I got the same problem when i use the digital lib in Electrical simulation.
the model is as follows:

model jktest
  annotation(Diagram(coordinateSystem(extent = {{ -100, -100},{100,100}})));
  annotation(uses(Modelica(version = "3.1")), Diagram(graphics));
  Modelica.Electrical.Digital.Examples.Utilities.JKFF jKFF annotation(Placement(transformation(origin = { -36.0,44.0}, extent = {{ -46.0,34.0},{ -26.0,54.0}}), iconTransformation(origin = { -36.0,44.0}, extent = {{ -46.0,34.0},{ -26.0,54.0}})));
  Modelica.Electrical.Digital.Sources.Set set(x = Modelica.Electrical.Digital.Interfaces.Logic.'1') annotation(Placement(transformation(origin = { -96.0,50.0}, extent = {{ -106.0,40.0},{ -86.0,60.0}}), iconTransformation(origin = { -96.0,50.0}, extent = {{ -106.0,40.0},{ -86.0,60.0}})));
  Modelica.Electrical.Digital.Sources.Clock clock(period = 0.4) annotation(Placement(transformation(origin = { -96.0,20.0}, extent = {{ -106.0,10.0},{ -86.0,30.0}}), iconTransformation(origin = { -96.0,20.0}, extent = {{ -106.0,10.0},{ -86.0,30.0}})));

equation
  connect(jKFF.j,set.y) annotation(Line(points = {{ -46.0,51.0},{ -70.0,51.0},{ -70.0,50.0},{ -86.0,50.0}}, color = {127,0,127}));
  connect(jKFF.k,set.y) annotation(Line(points = {{ -46.0,37.0},{ -70.0,37.0},{ -70.0,50.0},{ -86.0,50.0}}, color = {127,0,127}));
  connect(clock.y,jKFF.clk) annotation(Line(points = {{ -86.0,20.0},{ -68.0,20.0},{ -68.0,44.0},{ -46.0,44.0}}, color = {127,0,127}));
end jktest;


>> checkModel(jktest)
>> "Error: Error occured while flattening model jktest
"

>> instantiateModel(jktest)
>> "# Restriction violation: #getStateName failed# is not a CONNECTOR
# Restriction violation: #getStateName failed# is not a CONNECTOR
- Inst.instClassdef failed
  class :Modelica.Electrical.Digital.Interfaces.DigitalSignal
- Inst.instClassdef failed
  class :Modelica.Electrical.Digital.Interfaces.DigitalInput
- Inst.instClass: DigitalInput failed
- Inst.instVar2 failed: jKFF.j()
  Scope: Modelica.Electrical.Digital.Interfaces
- Inst.instVar failed while instatiating variable: jKFF.j  in scope: Modelica.Electrical.Digital.Interfaces
- Inst.instElement failed: COMPONENT(j in/out:  mod:  tp: D.Interfaces.DigitalInput var :VAR)
  Scope: Modelica.Electrical.Digital.Examples.Utilities.JKFF
- Inst.instClassdef failed
  class :Modelica.Electrical.Digital.Examples.Utilities.JKFF
- Inst.instClass: JKFF failed
- Inst.instVar2 failed: <Prefix.NOPRE()>.jKFF()
  Scope: Modelica.Electrical.Digital.Examples.Utilities
- Inst.instVar failed while instatiating variable: jKFF  in scope: Modelica.Electrical.Digital.Examples.Utilities
- Inst.instElement failed: COMPONENT(jKFF in/out:  mod:  tp: Modelica.Electrical.Digital.Examples.Utilities.JKFF var :VAR)
  Scope: jktest
- Inst.instClassdef failed
  class :jktest
- Inst.instClass: jktest failed
Inst.instClassInProgram failed
/*- CevalScript.cevalGenerateFunctionDAEs failed( instantiateModel )*/
/*- CevalScript.cevalGenerateFunction failed(instantiateModel)*/
# Restriction violation: #getStateName failed# is not a CONNECTOR
# Restriction violation: #getStateName failed# is not a CONNECTOR
- Inst.instClassdef failed
  class :Modelica.Electrical.Digital.Interfaces.DigitalSignal
- Inst.instClassdef failed
  class :Modelica.Electrical.Digital.Interfaces.DigitalInput
- Inst.instClass: DigitalInput failed
- Inst.instVar2 failed: jKFF.j()
  Scope: Modelica.Electrical.Digital.Interfaces
- Inst.instVar failed while instatiating variable: jKFF.j  in scope: Modelica.Electrical.Digital.Interfaces
- Inst.instElement failed: COMPONENT(j in/out:  mod:  tp: D.Interfaces.DigitalInput var :VAR)
  Scope: Modelica.Electrical.Digital.Examples.Utilities.JKFF
- Inst.instClassdef failed
  class :Modelica.Electrical.Digital.Examples.Utilities.JKFF
- Inst.instClass: JKFF failed
- Inst.instVar2 failed: <Prefix.NOPRE()>.jKFF()
  Scope: Modelica.Electrical.Digital.Examples.Utilities
- Inst.instVar failed while instatiating variable: jKFF  in scope: Modelica.Electrical.Digital.Examples.Utilities
- Inst.instElement failed: COMPONENT(jKFF in/out:  mod:  tp: Modelica.Electrical.Digital.Examples.Utilities.JKFF var :VAR)
  Scope: jktest
- Inst.instClassdef failed
  class :jktest
- Inst.instClass: jktest failed
Inst.instClassInProgram failed
"

Error: Too few equations, underdetermined system. The model has 4 equation(s) and 12 variable(s)

It flattens without errors using:
$ OPENMODELICAHOME=/usr OPENMODELICALIBRARY=/home/marsj/dev/sjoelund-functiontree/libraries/msl31/ omc a.mo Modelica

What version of OpenModelica are you using? Per recently made some fixes regarding the Digital examples.

i am using OpenModelica 1.5.0 with SimForge-0.9.0RC1 on Windows XP

Hi,

Try the new nightly-build:
http://build.openmodelica.org/omc/builds/windows/

Cheers,
Adrian Pop/

sjoelund.se wrote:

Error: Too few equations, underdetermined system. The model has 4 equation(s) and 12 variable(s)

It flattens without errors using:
$ OPENMODELICAHOME=/usr OPENMODELICALIBRARY=/home/marsj/dev/sjoelund-functiontree/libraries/msl31/ omc a.mo Modelica

What version of OpenModelica are you using? Per recently made some fixes regarding the Digital examples.

Thank you, sjoelund  and Adrian !
I got  the error now as sjoelund shows after installing the OpenModelica-revision-6464.msi.
But I could simulate the same model in Demola 7.0 which gave the right result, what can i do in OpenModelica?

It seems we have a bug in the back-end with equations - variables matching, most likely with array[array] indexing.
I added a bug report about it here, so our back-end experts can fix it:
https://openmodelica.org:8443/cb/issue/1329

Cheers,
Adrian Pop/

Thank you for your hard work last month, last error has been away.

Here comes another problem with this model by using OpenModelica-revision-6881.msi today.
here are the logs, It seems no "ERROR" defined before.
Thank you.


<jtest.log>

g++ -I"C:\OpenModelica1.5.1/include/omc" -msse2 -mfpmath=sse  -I. -o jktest.exe jktest.cpp -L"D:/omc/testjk/Modelica"  -lsim -L"C:\OpenModelica1.5.1/lib/omc" -lc_runtime -lf2c -linteractive -lsendData -lQtNetwork-mingw -lQtCore-mingw -lQtGui-mingw -luuid -lole32 -lws2_32
jktest.cpp: In function `int functionDAE_output()':
jktest.cpp:1143: error: `ERROR' was not declared in this scope
jktest.cpp:1143: error: expected `;' before "tmp30"
jktest.cpp:1147: warning: converting to `modelica_integer' from `double'
jktest.cpp:1149: error: `$PD$PTables$PNotTable' was not declared in this scope
jktest.cpp:1150: warning: converting to `modelica_integer' from `double'
jktest.cpp:1152: error: `$PD$PTables$PAndTable' was not declared in this scope
jktest.cpp:1152: error: cannot convert `double*' to `integer_array_t*' for argument `1' to `modelica_integer integer_get(integer_array_t*, size_t)'
jktest.cpp:1152: error: cannot convert `double*' to `integer_array_t*' for argument `1' to `modelica_integer integer_get(integer_array_t*, size_t)'
jktest.cpp:1152: error: cannot convert `double*' to `integer_array_t*' for argument `1' to `modelica_integer integer_get(integer_array_t*, size_t)'
jktest.cpp:1152: error: cannot convert `double*' to `integer_array_t*' for argument `1' to `modelica_integer integer_get(integer_array_t*, size_t)'
jktest.cpp:1153: warning: converting to `modelica_integer' from `double'
jktest.cpp:1155: error: cannot convert `double*' to `integer_array_t*' for argument `1' to `modelica_integer integer_get(integer_array_t*, size_t)'

...

<jktest.cpp>
from line 1141
modelica_boolean tmp28;
  modelica_boolean tmp29;
  expTypeFromExpFlag:ERROR tmp30;
 
  mem_state = get_memory_state();
  $Pclock$Pt_width = (($Pclock$Pperiod * $Pclock$Pwidth) / 100.0);
  tmp0 = pre($PjKFF$PNot1$Pauxiliary);
  $PjKFF$PNot1$Py = tmp0;
  $PjKFF$PNot1$Pauxiliary = (*integer_array_element_addr(&(*integer_array_element_addr(&$PD$PTables$PNotTable, 1, $PjKFF$PNot1$Px)), 1, $PjKFF$PNot1$Px));
  tmp1 = pre($PjKFF$PAnd4$Pauxiliary$lB2$rB);
  $PjKFF$PRS1$Pr = tmp1;
  $PjKFF$PAnd4$Pauxiliary$lB2$rB = (*integer_array_element_addr(&(*integer_array_element_addr(&$PD$PTables$PAndTable, 2, integer_get(&$PjKFF$PAnd4$Pauxiliary, 0), integer_get(&$PjKFF$PAnd4$Px, 1))), 2, integer_get(&$PjKFF$PAnd4$Pauxiliary, 0), integer_get(&$PjKFF$PAnd4$Px, 1)));
  tmp2 = pre($PjKFF$PAnd3$Pauxiliary$lB2$rB);
  $PjKFF$PRS1$Ps = tmp2;
  $PjKFF$PAnd3$Pauxiliary$lB2$rB = (*integer_array_element_addr(&(*integer_array_element_addr(&$PD$PTables$PAndTable, 2, integer_get(&$PjKFF$PAnd3$Pauxiliary, 0), integer_get(&$PjKFF$PAnd3$Px, 1))), 2, integer_get(&$PjKFF$PAnd3$Pauxiliary, 0), integer_get(&$PjKFF$PAnd3$Px, 1)));
  tmp3 = pre($PjKFF$PAnd2$Pauxiliary$lB3$rB);
  $PjKFF$PRS2$Pr = tmp3;
  $PjKFF$PAnd2$Pauxiliary$lB3$rB = (*integer_array_element_addr(&(*integer_array_element_addr(&$PD$PTables$PAndTable, 2, integer_get(&$PjKFF$PAnd2$Pauxiliary, 1), integer_get(&$PjKFF$PAnd2$Px, 2))), 2, integer_get(&$PjKFF$PAnd2$Pauxiliary, 1), integer_get(&$PjKFF$PAnd2$Px, 2)));
  $PjKFF$PAnd2$Pauxiliary$lB2$rB = (*integer_array_element_addr(&(*integer_array_element_addr(&$PD$PTables$PAndTable, 2, integer_get(&$PjKFF$PAnd2$Pauxiliary, 0), integer_get(&$PjKFF$PAnd2$Px, 1))), 2, integer_get(&$PjKFF$PAnd2$Pauxiliary, 0), integer_get(&$PjKFF$PAnd2$Px, 1)));
  tmp4 = pre($PjKFF$PAnd1$Pauxiliary$lB3$rB);
  $PjKFF$PRS2$Ps = tmp4;
  $PjKFF$PAnd1$Pauxiliary$lB3$rB = (*integer_array_element_addr(&(*integer_array_element_addr(&$PD$PTables$PAndTable, 2, integer_get(&$PjKFF$PAnd1$Pauxiliary, 1), integer_get(&$PjKFF$PAnd1$Px, 2))), 2, integer_get(&$PjKFF$PAnd1$Pauxiliary, 1), integer_get(&$PjKFF$PAnd1$Px, 2)));
  $PjKFF$PAnd1$Pauxiliary$lB2$rB = (*integer_array_element_addr(&(*integer_array_element_addr(&$PD$PTables$PAndTable, 2, integer_get(&$PjKFF$PAnd1$Pauxiliary, 0), integer_get(&$PjKFF$PAnd1$Px, 1))), 2, integer_get(&$PjKFF$PAnd1$Pauxiliary, 0), integer_get(&$PjKFF$PAnd1$Px, 1)));
  tmp5 = pre((*integer_array_element_addr(&(*integer_array_element_addr(&$PD$PTables$PNotTable, 1, integer_get(&$PjKFF$PRS2$PNor2$Pauxiliary, 1))), 1, integer_get(&$PjKFF$PRS2$PNor2$Pauxiliary, 1))));
  $PjKFF$PRS2$Pq = tmp5;

It seems this is a code generation problem for enumerations (clock.y has type Logic = enumeration(
        'U' "U  Uninitialized",
        'X' "X  Forcing Unknown",
        '0' "0  Forcing 0",
        '1' "1  Forcing 1",
        'Z' "Z  High Impedance",
        'W' "W  Weak    Unknown",
        'L' "L  Weak    0",
        'H' "H  Weak    1",
        '-' "-  Don't care")).

There seems to be some other issues as well... import D = Modelica.Electrical.Digital; seems to leave some constants as D.xxx.yyy.zzz in the generated code.

hi sir i am new at hare sir i am try to make the model of Rankine cycle but these are error's.

[:0:0-0:0] Error: Error occurred while flattening model plaanti
[C:\OpenModelica1.9.1Beta2\lib\omlibrary\Modelica 3.2.1\Media\package.mo:4380:17-4505:25] Error: Illegal to instantiate partial class BaseProperties.
[:0:0-0:0] Notification: Instantiation of plaanti failed.

kindly help me
.

Hello to all,

I'm having a "flattening" problem with no hints from the Modelica compiler when I try to simulate my model.  It's actually a model I got out of a presentation, and I was just trying it out.  I found a couple of problems and fixed them (related to the math), but I still get this "flattening" error.  I've tried all sorts of simplifications, one by one, to see if anything would get me around this problem, but no luck, and Modelica just seems to be sitting there like the Cheshire cat.  Here's the model:

block StateSpace
        parameter Real A[:, :];
    parameter Real B[size(A,1), :];
    parameter Real C[:, size(A,2)];
    parameter Real D[size(C,1), size(B,2)] = zeros(size(C,1), size(B,2));
    input    Real u[size(B,2)];
    output   Real y[size(C,1)];
   
    protected
        Real x[size(A,2)];
    equation
        assert( size(A,1) == size (A,2), "Matrix A must be square.");
        der(x) = A*x + B*u;
        y      = C*x + D*u;
end StateSpace;

block TestSS
    StateSpace S(A=[1,2; 3,4], B=[0;1], C=[1,1]);
equation
    S.u = sin(time);
end TestSS;

Here's the result of simulate(StateSpace, stopTime=5):

>> simulate(StateSpace, stopTime=5)
record SimulationResult
    resultFile = "",
    simulationOptions = "startTime = 0.0, stopTime = 5.0, numberOfIntervals = 500, tolerance = 1e-006, method = 'dassl', fileNamePrefix = 'StateSpace', options = '', outputFormat = 'mat', variableFilter = '.*', cflags = '', simflags = ''",
    messages = "Failed to build model: StateSpace",
    timeFrontend = 0.0,
    timeBackend = 0.0,
    timeSimCode = 0.0,
    timeTemplates = 0.0,
    timeCompile = 0.0,
    timeSimulation = 0.0,
    timeTotal = 0.0
end SimulationResult;
Error: Error occurred while flattening model StateSpace

I'm using OMShell 1.1 conected to OpenModelica v1.9.6.

Any help would be appreciated. 

Thanks, AlphaOmega

I guess it is due to the model having : as dimensions.

Hi...as per my knowledge the true problem is, that 1.5 final in fact is somthing which normally would be labeled as an early beta release. Maybe it will work better in half a year, maybe in a year, maybe never.If you work with Modelica professionally, you could consider commercial environments - They are not cheap, but it pays off.

turnkey pcb assembly