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by jfrenkel on 11 Mar 2014 14:49 UTC**\nRegarding to Specification I could only find in Chapter 12 how to initialize local variables in functions but not how to initialize output variables in functions. Maybe I simple not found it but I thinks it should be clear defined to avoid unexpected behavior.\n\nIn the past I reported some tickets about usage of uninitialized variables in functions.\n#1412\n#1425\n#1427\n#1428\n#1429\n#1430\n\n* If output variables of functions are initialized automatic (type default value) this tickets may should be interpreted again. \n* If output variables of functions not automatic initialized I have a list of MSL functions return (not in all cases) undefined values for some outputs. (For example #1422)\n\n----\n\nMigrated-From: https://trac.modelica.org/Modelica/ticket/1440"},"comment":{"url":"https://api.github.com/repos/modelica/ModelicaSpecification/issues/comments/435649883","html_url":"https://github.com/modelica/ModelicaSpecification/issues/1440#issuecomment-435649883","issue_url":"https://api.github.com/repos/modelica/ModelicaSpecification/issues/1440","id":435649883,"node_id":"MDEyOklzc3VlQ29tbWVudDQzNTY0OTg4Mw==","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":"2018-11-04T07:56:59Z","updated_at":"2018-11-04T07:56:59Z","author_association":"COLLABORATOR","body":"**Comment by sjoelund&#x2e;se on 12 Mar 2014 05:50 UTC**\nIf you read 12.4.4 it becomes clear that unbound output formal parameters also have undefined value.\n\nAlso, if you want to be picky about uninitialized things, many of the external lapack functions called do not always modify the output. So if you don't initialize the output (to 0 or zeros) **_and_** call it the function using the variable as output you should get undefined results. I think most tools instead initialize to 0 for external functions to avoid problems, but the MSL has some of these lapack functions that could be fixed also at the Modelica source."}}
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