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by fcasella on 19 May 2011 11:40 UTC**\nConsider the following statement:\n```\nconnect(c,c);\n```\nBesides being obviously useless, this statement is fatal, because it makes the system of equations overdetermined and ill-posed at the same time: equations such as\n```\nc.v = c.v;\n```\nwill be added to an otherwise balanced system, increasing the equation count by one, while not introducing any extra variable.\n\nUnfortunately, it is quite easy to accidentally generate such statements by a GUI, if one clicks in the wrong place. Even more unfortunately, such connections are impossible to spot graphically, because there is really no connection line to be seen anywhere.\n\nI'd suggest to add one more clause to section 9.3 of the specification by stating that such a statement is illegal.\n\n----\n\nMigrated-From: https://trac.modelica.org/Modelica/ticket/552"},"comment":{"url":"https://api.github.com/repos/tbeu/ModelicaSpecification/issues/comments/431536696","html_url":"https://github.com/tbeu/ModelicaSpecification/issues/168#issuecomment-431536696","issue_url":"https://api.github.com/repos/tbeu/ModelicaSpecification/issues/168","id":431536696,"node_id":"MDEyOklzc3VlQ29tbWVudDQzMTUzNjY5Ng==","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":"2018-10-20T01:14:08Z","updated_at":"2018-10-20T01:14:08Z","author_association":"COLLABORATOR","body":"**Comment by adrpo on 20 Nov 2011 11:00 UTC**\n\nThere's more, as always...\nHow about connect(a, a) where a is part of the overconstrained graph that should be broken. You break the connect(a, a) because is a cycle and end up with the equalityConstraint function call instead which makes your system overconstrained. Quite some irony that breaking this cycle in the overconstrained connection graph leads to an overconstrained system :)\n\nCheers,\nAdrian Pop/ "}}
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