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Modelica Design Meeting in Coventry, UK","creator":{"login":"modelica-trac-importer","id":22202507,"node_id":"MDQ6VXNlcjIyMjAyNTA3","avatar_url":"https://avatars1.githubusercontent.com/u/22202507?v=4","gravatar_id":"","url":"https://api.github.com/users/modelica-trac-importer","html_url":"https://github.com/modelica-trac-importer","followers_url":"https://api.github.com/users/modelica-trac-importer/followers","following_url":"https://api.github.com/users/modelica-trac-importer/following{/other_user}","gists_url":"https://api.github.com/users/modelica-trac-importer/gists{/gist_id}","starred_url":"https://api.github.com/users/modelica-trac-importer/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/modelica-trac-importer/subscriptions","organizations_url":"https://api.github.com/users/modelica-trac-importer/orgs","repos_url":"https://api.github.com/users/modelica-trac-importer/repos","events_url":"https://api.github.com/users/modelica-trac-importer/events{/privacy}","received_events_url":"https://api.github.com/users/modelica-trac-importer/received_events","type":"User","site_admin":false},"open_issues":1,"closed_issues":1,"state":"closed","created_at":"2018-10-19T18:42:20Z","updated_at":"2018-10-20T06:09:43Z","due_on":"2013-06-05T07:00:00Z","closed_at":"2018-10-19T18:42:20Z"},"comments":9,"created_at":"2018-10-20T06:09:43Z","updated_at":"2018-10-20T06:11:35Z","closed_at":null,"author_association":"COLLABORATOR","body":"**Reported by fcasella on 19 Dec 2012 14:02 UTC**\nDerivatives can be unknowns of nonlinear algebraic systems of equations, in particular when solving initialization problems. \n\nCurrently, there is no way to specify an initial guess for the iterative solver (i.e., the start attribute), nor to set the min, max, and nominal attributes, which could help the solver doing its job.\n\nSee also comment 4 of #933\n\n----\n\nMigrated-From: https://trac.modelica.org/Modelica/ticket/934"},"comment":{"url":"https://api.github.com/repos/tbeu/ModelicaSpecification/issues/comments/431553169","html_url":"https://github.com/tbeu/ModelicaSpecification/issues/313#issuecomment-431553169","issue_url":"https://api.github.com/repos/tbeu/ModelicaSpecification/issues/313","id":431553169,"node_id":"MDEyOklzc3VlQ29tbWVudDQzMTU1MzE2OQ==","user":{"login":"modelica-trac-importer","id":22202507,"node_id":"MDQ6VXNlcjIyMjAyNTA3","avatar_url":"https://avatars1.githubusercontent.com/u/22202507?v=4","gravatar_id":"","url":"https://api.github.com/users/modelica-trac-importer","html_url":"https://github.com/modelica-trac-importer","followers_url":"https://api.github.com/users/modelica-trac-importer/followers","following_url":"https://api.github.com/users/modelica-trac-importer/following{/other_user}","gists_url":"https://api.github.com/users/modelica-trac-importer/gists{/gist_id}","starred_url":"https://api.github.com/users/modelica-trac-importer/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/modelica-trac-importer/subscriptions","organizations_url":"https://api.github.com/users/modelica-trac-importer/orgs","repos_url":"https://api.github.com/users/modelica-trac-importer/repos","events_url":"https://api.github.com/users/modelica-trac-importer/events{/privacy}","received_events_url":"https://api.github.com/users/modelica-trac-importer/received_events","type":"User","site_admin":false},"created_at":"2018-10-20T06:11:35Z","updated_at":"2018-10-20T06:11:35Z","author_association":"COLLABORATOR","body":"**Comment by hansolsson on 21 Dec 2012 11:27 UTC**\nShort answer:\nFor the next release of Dymola we will (likely) change it so that those iteration variables are not treated as errors for pedantic mode.\n\n\nLong answer:\n\\--\nIn general:\nHowever, issues are not always ok or error. There can also be issues that unambigous, well-defined according to the spec; but still should be avoided since they are not good style. In several cases the specification recommends diagnostics even if defining the result - I hope you agree that those should also be avoided.\n\nFor this case:\nI agree that the specific iteration variables lacking a start-values is not really an issue. However, it is a minor issue that there exists a non-linear system, where a tool will need to select some iteration variables and not all of the possible iteration variables have start-values, since there could be problems with convergence or multiple solutions.\n\nHow problematic this is depends on the model and the variables, and derivative-variables are usually the least problematic ones."}}
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