{"action":"created","issue":{"url":"https://api.github.com/repos/akc/hops/issues/3","repository_url":"https://api.github.com/repos/akc/hops","labels_url":"https://api.github.com/repos/akc/hops/issues/3/labels{/name}","comments_url":"https://api.github.com/repos/akc/hops/issues/3/comments","events_url":"https://api.github.com/repos/akc/hops/issues/3/events","html_url":"https://github.com/akc/hops/pull/3","id":183267299,"number":3,"title":"Speed up euler function","user":{"login":"bawolk","id":375816,"avatar_url":"https://avatars.githubusercontent.com/u/375816?v=3","gravatar_id":"","url":"https://api.github.com/users/bawolk","html_url":"https://github.com/bawolk","followers_url":"https://api.github.com/users/bawolk/followers","following_url":"https://api.github.com/users/bawolk/following{/other_user}","gists_url":"https://api.github.com/users/bawolk/gists{/gist_id}","starred_url":"https://api.github.com/users/bawolk/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bawolk/subscriptions","organizations_url":"https://api.github.com/users/bawolk/orgs","repos_url":"https://api.github.com/users/bawolk/repos","events_url":"https://api.github.com/users/bawolk/events{/privacy}","received_events_url":"https://api.github.com/users/bawolk/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":1,"created_at":"2016-10-16T13:36:23Z","updated_at":"2016-10-17T17:34:26Z","closed_at":null,"pull_request":{"url":"https://api.github.com/repos/akc/hops/pulls/3","html_url":"https://github.com/akc/hops/pull/3","diff_url":"https://github.com/akc/hops/pull/3.diff","patch_url":"https://github.com/akc/hops/pull/3.patch"},"body":"For high precision calculations, this simple change more than doubles the speed.  Raising [0,1] to the kth power requires a large number of multiplications, most of which involve zero.  "},"comment":{"url":"https://api.github.com/repos/akc/hops/issues/comments/254277089","html_url":"https://github.com/akc/hops/pull/3#issuecomment-254277089","issue_url":"https://api.github.com/repos/akc/hops/issues/3","id":254277089,"user":{"login":"akc","id":1318982,"avatar_url":"https://avatars.githubusercontent.com/u/1318982?v=3","gravatar_id":"","url":"https://api.github.com/users/akc","html_url":"https://github.com/akc","followers_url":"https://api.github.com/users/akc/followers","following_url":"https://api.github.com/users/akc/following{/other_user}","gists_url":"https://api.github.com/users/akc/gists{/gist_id}","starred_url":"https://api.github.com/users/akc/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/akc/subscriptions","organizations_url":"https://api.github.com/users/akc/orgs","repos_url":"https://api.github.com/users/akc/repos","events_url":"https://api.github.com/users/akc/events{/privacy}","received_events_url":"https://api.github.com/users/akc/received_events","type":"User","site_admin":false},"created_at":"2016-10-17T17:34:26Z","updated_at":"2016-10-17T17:34:26Z","body":"I'm not against this change, but I wonder if there might be a more general solution. E.g. the `weight` transform and the `(^!)` function (in `Series`) might also benefit from this type of optimization. Would the modification of `mul` you suggested a while ago provide the desired optimization?"}}
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