{"action":"created","issue":{"url":"https://api.github.com/repos/sympy/sympy/issues/11002","repository_url":"https://api.github.com/repos/sympy/sympy","labels_url":"https://api.github.com/repos/sympy/sympy/issues/11002/labels{/name}","comments_url":"https://api.github.com/repos/sympy/sympy/issues/11002/comments","events_url":"https://api.github.com/repos/sympy/sympy/issues/11002/events","html_url":"https://github.com/sympy/sympy/pull/11002","id":147919113,"number":11002,"title":"Use SymEngine in `n_link_pendulum_on_cart`","user":{"login":"isuruf","id":5234427,"avatar_url":"https://avatars.githubusercontent.com/u/5234427?v=3","gravatar_id":"","url":"https://api.github.com/users/isuruf","html_url":"https://github.com/isuruf","followers_url":"https://api.github.com/users/isuruf/followers","following_url":"https://api.github.com/users/isuruf/following{/other_user}","gists_url":"https://api.github.com/users/isuruf/gists{/gist_id}","starred_url":"https://api.github.com/users/isuruf/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/isuruf/subscriptions","organizations_url":"https://api.github.com/users/isuruf/orgs","repos_url":"https://api.github.com/users/isuruf/repos","events_url":"https://api.github.com/users/isuruf/events{/privacy}","received_events_url":"https://api.github.com/users/isuruf/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":21,"created_at":"2016-04-13T01:25:08Z","updated_at":"2016-07-01T04:20:21Z","closed_at":null,"pull_request":{"url":"https://api.github.com/repos/sympy/sympy/pulls/11002","html_url":"https://github.com/sympy/sympy/pull/11002","diff_url":"https://github.com/sympy/sympy/pull/11002.diff","patch_url":"https://github.com/sympy/sympy/pull/11002.patch"},"body":"When environment variable `USE_SYMENGINE` is set to 1, underlying symbolic engine for sympy.physics is switched to SymEngine\r\n\r\nTimings for `n_link_pendulum_on_cart(n)`\r\n\r\nn | SymEngine + SymPy | SymPy only | Speedup\r\n------------ | ------------- | ------------- | -------\r\n10 | 0.17 s | 5.58 s | 32.8x |\r\n15 | 0.44 s | 22.07 s | 50.1x |\r\n20 | 0.95 s | 45.59 s | 47.9x |\r\n30 | 3.11 s | 162.80 s | 52.3x |\r\n40 | 7.02 s | 427.16 s | 60.8x |\r\n50 | 13.95 s | 915.83 s | 65.6x |\r\n60 | 25.22 s | .....................\r\n\r\nNeeds latest [symengine/symengine](https://github.com/symengine/symengine) master and [symengine/symengine.py](https://github.com/symengine/symengine.py) to run.\r\n\r\ncc @certik, @moorepants "},"comment":{"url":"https://api.github.com/repos/sympy/sympy/issues/comments/229850619","html_url":"https://github.com/sympy/sympy/pull/11002#issuecomment-229850619","issue_url":"https://api.github.com/repos/sympy/sympy/issues/11002","id":229850619,"user":{"login":"isuruf","id":5234427,"avatar_url":"https://avatars.githubusercontent.com/u/5234427?v=3","gravatar_id":"","url":"https://api.github.com/users/isuruf","html_url":"https://github.com/isuruf","followers_url":"https://api.github.com/users/isuruf/followers","following_url":"https://api.github.com/users/isuruf/following{/other_user}","gists_url":"https://api.github.com/users/isuruf/gists{/gist_id}","starred_url":"https://api.github.com/users/isuruf/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/isuruf/subscriptions","organizations_url":"https://api.github.com/users/isuruf/orgs","repos_url":"https://api.github.com/users/isuruf/repos","events_url":"https://api.github.com/users/isuruf/events{/privacy}","received_events_url":"https://api.github.com/users/isuruf/received_events","type":"User","site_admin":false},"created_at":"2016-07-01T04:20:20Z","updated_at":"2016-07-01T04:20:20Z","body":"I've added tests. Let me know what you think"}}
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