{"action":"opened","issue":{"url":"https://api.github.com/repos/nengo/nengo/issues/772","labels_url":"https://api.github.com/repos/nengo/nengo/issues/772/labels{/name}","comments_url":"https://api.github.com/repos/nengo/nengo/issues/772/comments","events_url":"https://api.github.com/repos/nengo/nengo/issues/772/events","html_url":"https://github.com/nengo/nengo/issues/772","id":93621329,"number":772,"title":"Can't connect an error (size_out=1) to a learning rule object with size_in = 3","user":{"login":"s72sue","id":12284191,"avatar_url":"https://avatars.githubusercontent.com/u/12284191?v=3","gravatar_id":"","url":"https://api.github.com/users/s72sue","html_url":"https://github.com/s72sue","followers_url":"https://api.github.com/users/s72sue/followers","following_url":"https://api.github.com/users/s72sue/following{/other_user}","gists_url":"https://api.github.com/users/s72sue/gists{/gist_id}","starred_url":"https://api.github.com/users/s72sue/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/s72sue/subscriptions","organizations_url":"https://api.github.com/users/s72sue/orgs","repos_url":"https://api.github.com/users/s72sue/repos","events_url":"https://api.github.com/users/s72sue/events{/privacy}","received_events_url":"https://api.github.com/users/s72sue/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-07-07T20:30:42Z","updated_at":"2015-07-07T20:30:42Z","closed_at":null,"body":"There seems to be no way to connect an error (with size_out=1) to a learning rule object with size_in=3.  It seems like you need to specify a (3x1) transform:\r\n![image](https://cloud.githubusercontent.com/assets/12284191/8555525/a37d9eda-24be-11e5-803b-8dcdaa945e93.png)\r\nOr a function:\r\n![test2](https://cloud.githubusercontent.com/assets/12284191/8556502/632a46d8-24c5-11e5-83b9-223c231ca245.png)\r\n\r\nHowever, both of the above approaches give a run time erorr in PES:\r\n![image](https://cloud.githubusercontent.com/assets/12284191/8555466/531cbd04-24be-11e5-9802-c8af5667d21c.png)"}}