no support for mixed systems containing algorithms

[Lennart Ochel]

It seems that there is no support for mixed systems that contain algorithms.
Example:

model test
  Real a;
  Integer b;
algorithm
  b:=if a > 0 then 1 else -1;
algorithm
  a:=b * time;
end test;

Output:

Translation	13:38:22		0:0-0:0	Internal error ./Compiler/BackEnd/SimCodeUtil.mo: function createSimCode failed [Transformation from optimised DAE to simulation code structure failed]
Translation	13:38:22		0:0-0:0	Internal error ./Compiler/BackEnd/SimCodeUtil.mo: function createEquationsForSystem1 failed
Translation	13:38:22		0:0-0:0	Internal error ./Compiler/BackEnd/SimCodeUtil.mo: function createEquationsForSystem1 failed for component {{1:1},
{2:2} Size: 1 No analytic jacobian} Size: 1
Translation	13:38:22		0:0-0:0	Internal error ./Compiler/BackEnd/SimCodeUtil.mo: function createOdeSystem failed for component {{1:1},
{2:2} Size: 1 No analytic jacobian} Size: 1
Translation	13:38:22		0:0-0:0	Internal error ./Compiler/BackEnd/SimCodeUtil.mo: function extractDiscEqs failed!

[Lennart Ochel]

Probably OpenModelica is not able to solve any mixed system containing integer variables. It seems that only Boolean variables are supported – in some way. Mixed systems containing integer variables are only solved using tearing. So this is probably a tearing ticket?!

[Martin Sjölund]

Or about adding support for solving mixed integer systems :)

[Willi Braun]

yes, Martin is right.
We haven't support for mixed integer system at all.

[Lennart Ochel]

Minor modifications to the initial example to get more interesting trajectories:

model test
  Real a;
  Integer b;
algorithm 
  b:=if a > 0 then integer(time*10) else -integer(time*10);
algorithm 
  a:=b * time;
end test;

[Lennart Ochel]

With the following modification this model works fine using OpenModelica:

model test
  Real a;
  Integer b;
  Boolean c;
algorithm
  c := a > 0;
algorithm 
  b := if c then integer(time*10) else -integer(time*10);
algorithm 
  a := b * time;
end test;

[Willi Braun]

Replying to lochel:

With the following modification this model works fine using OpenModelica:

model test
  Real a;
  Integer b;
  Boolean c;
algorithm
  c := a > 0;
algorithm 
  b := if c then integer(time*10) else -integer(time*10);
algorithm 
  a := b * time;
end test;

That model doesn't work neither for me. Also same error message.

[Lennart Ochel]

Replying to wbraun:

That model doesn't work neither for me. Also same error message.

You are using linux, right? That model works fine for me using omc 1.9.1+dev (r17769) on Windows.