payload: {"action":"created","issue":{"url":"https://api.github.com/repos/RobotLocomotion/drake/issues/10616","repository_url":"https://api.github.com/repos/RobotLocomotion/drake","labels_url":"https://api.github.com/repos/RobotLocomotion/drake/issues/10616/labels{/name}","comments_url":"https://api.github.com/repos/RobotLocomotion/drake/issues/10616/comments","events_url":"https://api.github.com/repos/RobotLocomotion/drake/issues/10616/events","html_url":"https://github.com/RobotLocomotion/drake/issues/10616","id":407746459,"node_id":"MDU6SXNzdWU0MDc3NDY0NTk=","number":10616,"title":"Symbolic expressions from random distributions with the same parameters are not equal","user":{"login":"sammy-tri","id":17596504,"node_id":"MDQ6VXNlcjE3NTk2NTA0","avatar_url":"https://avatars3.githubusercontent.com/u/17596504?v=4","gravatar_id":"","url":"https://api.github.com/users/sammy-tri","html_url":"https://github.com/sammy-tri","followers_url":"https://api.github.com/users/sammy-tri/followers","following_url":"https://api.github.com/users/sammy-tri/following{/other_user}","gists_url":"https://api.github.com/users/sammy-tri/gists{/gist_id}","starred_url":"https://api.github.com/users/sammy-tri/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sammy-tri/subscriptions","organizations_url":"https://api.github.com/users/sammy-tri/orgs","repos_url":"https://api.github.com/users/sammy-tri/repos","events_url":"https://api.github.com/users/sammy-tri/events{/privacy}","received_events_url":"https://api.github.com/users/sammy-tri/received_events","type":"User","site_admin":false},"labels":[{"id":333413819,"node_id":"MDU6TGFiZWwzMzM0MTM4MTk=","url":"https://api.github.com/repos/RobotLocomotion/drake/labels/team:%20manipulation","name":"team: manipulation","color":"0052cc","default":false}],"state":"closed","locked":false,"assignee":{"login":"soonho-tri","id":20779767,"node_id":"MDQ6VXNlcjIwNzc5NzY3","avatar_url":"https://avatars3.githubusercontent.com/u/20779767?v=4","gravatar_id":"","url":"https://api.github.com/users/soonho-tri","html_url":"https://github.com/soonho-tri","followers_url":"https://api.github.com/users/soonho-tri/followers","following_url":"https://api.github.com/users/soonho-tri/following{/other_user}","gists_url":"https://api.github.com/users/soonho-tri/gists{/gist_id}","starred_url":"https://api.github.com/users/soonho-tri/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/soonho-tri/subscriptions","organizations_url":"https://api.github.com/users/soonho-tri/orgs","repos_url":"https://api.github.com/users/soonho-tri/repos","events_url":"https://api.github.com/users/soonho-tri/events{/privacy}","received_events_url":"https://api.github.com/users/soonho-tri/received_events","type":"User","site_admin":false},"assignees":[{"login":"soonho-tri","id":20779767,"node_id":"MDQ6VXNlcjIwNzc5NzY3","avatar_url":"https://avatars3.githubusercontent.com/u/20779767?v=4","gravatar_id":"","url":"https://api.github.com/users/soonho-tri","html_url":"https://github.com/soonho-tri","followers_url":"https://api.github.com/users/soonho-tri/followers","following_url":"https://api.github.com/users/soonho-tri/following{/other_user}","gists_url":"https://api.github.com/users/soonho-tri/gists{/gist_id}","starred_url":"https://api.github.com/users/soonho-tri/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/soonho-tri/subscriptions","organizations_url":"https://api.github.com/users/soonho-tri/orgs","repos_url":"https://api.github.com/users/soonho-tri/repos","events_url":"https://api.github.com/users/soonho-tri/events{/privacy}","received_events_url":"https://api.github.com/users/soonho-tri/received_events","type":"User","site_admin":false}],"milestone":null,"comments":4,"created_at":"2019-02-07T15:10:03Z","updated_at":"2019-02-07T17:53:50Z","closed_at":"2019-02-07T17:53:50Z","author_association":"CONTRIBUTOR","body":"Expressions containing random variables from distributions with the same parameters are not equal according to `ExprEqual` even though their string values are identical.\r\n\r\nTest code:\r\n```c++\r\n    normal_distribution<Expression> d1(1.0, 2.0);\r\n    normal_distribution<Expression> d2(1.0, 2.0);\r\n    EXPECT_PRED2(ExprEqual, d1(), d2());\r\n```\r\nresults in:\r\n```\r\nExprEqual(d1(), d2()) evaluates to false, where\r\nd1() evaluates to (1 + 2 * random_gaussian_0)\r\nd2() evaluates to (1 + 2 * random_gaussian_0)\r\n```"},"comment":{"url":"https://api.github.com/repos/RobotLocomotion/drake/issues/comments/461530682","html_url":"https://github.com/RobotLocomotion/drake/issues/10616#issuecomment-461530682","issue_url":"https://api.github.com/repos/RobotLocomotion/drake/issues/10616","id":461530682,"node_id":"MDEyOklzc3VlQ29tbWVudDQ2MTUzMDY4Mg==","user":{"login":"soonho-tri","id":20779767,"node_id":"MDQ6VXNlcjIwNzc5NzY3","avatar_url":"https://avatars3.githubusercontent.com/u/20779767?v=4","gravatar_id":"","url":"https://api.github.com/users/soonho-tri","html_url":"https://github.com/soonho-tri","followers_url":"https://api.github.com/users/soonho-tri/followers","following_url":"https://api.github.com/users/soonho-tri/following{/other_user}","gists_url":"https://api.github.com/users/soonho-tri/gists{/gist_id}","starred_url":"https://api.github.com/users/soonho-tri/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/soonho-tri/subscriptions","organizations_url":"https://api.github.com/users/soonho-tri/orgs","repos_url":"https://api.github.com/users/soonho-tri/repos","events_url":"https://api.github.com/users/soonho-tri/events{/privacy}","received_events_url":"https://api.github.com/users/soonho-tri/received_events","type":"User","site_admin":false},"created_at":"2019-02-07T17:53:50Z","updated_at":"2019-02-07T17:53:50Z","author_association":"MEMBER","body":"OK. Let me close this for now. If a similar issue comes out, I'll improve it then."}}
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