User Portlet
| Discussions |
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| > NOTE: Sorry, I replied to myself but should be to you. I don't know how to delete. Obviously me neither. |
| Yes, System Modeler comes with a small selection of ODE integration methods. To change method, go to the Settings tab of the Experiment Browser in Simulation Center. Near the top of that tab you find the Solver popup menu, where DASSL is the... |
| Hi, the general problem you are encountering is that it is not allowed to construct over-constrained equation systems. Connecting a fixed translation between two points that already have a fixed translational relation is an example of creating an... |
| Good to hear. Even though the update fixed your problem, this report helped us identify a corner case problem that will be fixed in the next version. Thanks! |
| One more thing: I see now that the problematic equation system is in the initialization problem, meaning that the observation above regarding integration of angular velocities doesn't really apply. Initialization can be tricky, but debugging is... |
| That's good to hear. Don't hesitate to tell us about your application in case you think that the kind of string processing you were doing could be of general interest – requests like that are important for setting the right priorities for future... |
| No, that is not possible, and there is no guarantee that two different Modelica tools (or two different versions of the same tool) will make the same choice of equations. Actually, there is technically not even a guarantee that there will be a... |
| Instead of speaking of the component base class, could you please provide a complete simulation model that illustrates the problem? |
| I am unable to reproduce the problem. Which version of SystemModeler did you use? (This is not a problem with your C++ compiler, but a problem with differentiation of top level inputs.) |
| Sparsity is utilized in in several ways by SystemModeler. First, the symbolic processing applies standard techniques such as transformation into block lower triangular form and tearing. Then, sparsity of linear equation systems at runtime are... |