{"action":"created","issue":{"url":"https://api.github.com/repos/mathics/Mathics/issues/375","repository_url":"https://api.github.com/repos/mathics/Mathics","labels_url":"https://api.github.com/repos/mathics/Mathics/issues/375/labels{/name}","comments_url":"https://api.github.com/repos/mathics/Mathics/issues/375/comments","events_url":"https://api.github.com/repos/mathics/Mathics/issues/375/events","html_url":"https://github.com/mathics/Mathics/issues/375","id":154243831,"number":375,"title":"Derivative of vector-valued function","user":{"login":"abrock","id":31710,"avatar_url":"https://avatars.githubusercontent.com/u/31710?v=3","gravatar_id":"","url":"https://api.github.com/users/abrock","html_url":"https://github.com/abrock","followers_url":"https://api.github.com/users/abrock/followers","following_url":"https://api.github.com/users/abrock/following{/other_user}","gists_url":"https://api.github.com/users/abrock/gists{/gist_id}","starred_url":"https://api.github.com/users/abrock/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/abrock/subscriptions","organizations_url":"https://api.github.com/users/abrock/orgs","repos_url":"https://api.github.com/users/abrock/repos","events_url":"https://api.github.com/users/abrock/events{/privacy}","received_events_url":"https://api.github.com/users/abrock/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":1,"created_at":"2016-05-11T13:29:27Z","updated_at":"2016-05-11T14:01:07Z","closed_at":null,"body":"Derivative calculation works for scalar-valued functions:\r\n\r\nIn[56]:= p[x_] := x^2\r\nIn[57]:= p'[x]\r\nOut[57]= 2 x\r\n\r\nBut not for vector-valued functions:\r\n\r\nIn[58]:= p[x_] := {x^2}\r\nIn[59]:= p'[x]\r\nOut[59]= {0}\r\n\r\nI was expecting {2x}."},"comment":{"url":"https://api.github.com/repos/mathics/Mathics/issues/comments/218468244","html_url":"https://github.com/mathics/Mathics/issues/375#issuecomment-218468244","issue_url":"https://api.github.com/repos/mathics/Mathics/issues/375","id":218468244,"user":{"login":"abrock","id":31710,"avatar_url":"https://avatars.githubusercontent.com/u/31710?v=3","gravatar_id":"","url":"https://api.github.com/users/abrock","html_url":"https://github.com/abrock","followers_url":"https://api.github.com/users/abrock/followers","following_url":"https://api.github.com/users/abrock/following{/other_user}","gists_url":"https://api.github.com/users/abrock/gists{/gist_id}","starred_url":"https://api.github.com/users/abrock/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/abrock/subscriptions","organizations_url":"https://api.github.com/users/abrock/orgs","repos_url":"https://api.github.com/users/abrock/repos","events_url":"https://api.github.com/users/abrock/events{/privacy}","received_events_url":"https://api.github.com/users/abrock/received_events","type":"User","site_admin":false},"created_at":"2016-05-11T14:01:07Z","updated_at":"2016-05-11T14:01:07Z","body":"Integration in contrast works just fine:\r\n\r\n`In[68]:= Integrate[{t, t^2}, {t,0,1}]`\r\n`Out[68]= {1 / 2, 1 / 3}`"}}