{"action":"created","issue":{"url":"https://api.github.com/repos/hughrawlinson/meyda/issues/12","repository_url":"https://api.github.com/repos/hughrawlinson/meyda","labels_url":"https://api.github.com/repos/hughrawlinson/meyda/issues/12/labels{/name}","comments_url":"https://api.github.com/repos/hughrawlinson/meyda/issues/12/comments","events_url":"https://api.github.com/repos/hughrawlinson/meyda/issues/12/events","html_url":"https://github.com/hughrawlinson/meyda/issues/12","id":44579797,"number":12,"title":"Add Auto Correlation Feature Extractor","user":{"login":"hughrawlinson","id":829836,"avatar_url":"https://avatars.githubusercontent.com/u/829836?v=3","gravatar_id":"","url":"https://api.github.com/users/hughrawlinson","html_url":"https://github.com/hughrawlinson","followers_url":"https://api.github.com/users/hughrawlinson/followers","following_url":"https://api.github.com/users/hughrawlinson/following{/other_user}","gists_url":"https://api.github.com/users/hughrawlinson/gists{/gist_id}","starred_url":"https://api.github.com/users/hughrawlinson/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/hughrawlinson/subscriptions","organizations_url":"https://api.github.com/users/hughrawlinson/orgs","repos_url":"https://api.github.com/users/hughrawlinson/repos","events_url":"https://api.github.com/users/hughrawlinson/events{/privacy}","received_events_url":"https://api.github.com/users/hughrawlinson/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/hughrawlinson/meyda/labels/feature-extractor","name":"feature-extractor","color":"f7c6c7"},{"url":"https://api.github.com/repos/hughrawlinson/meyda/labels/ready","name":"ready","color":"ededed"}],"state":"open","locked":false,"assignee":{"login":"nevosegal","id":3370167,"avatar_url":"https://avatars.githubusercontent.com/u/3370167?v=3","gravatar_id":"","url":"https://api.github.com/users/nevosegal","html_url":"https://github.com/nevosegal","followers_url":"https://api.github.com/users/nevosegal/followers","following_url":"https://api.github.com/users/nevosegal/following{/other_user}","gists_url":"https://api.github.com/users/nevosegal/gists{/gist_id}","starred_url":"https://api.github.com/users/nevosegal/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/nevosegal/subscriptions","organizations_url":"https://api.github.com/users/nevosegal/orgs","repos_url":"https://api.github.com/users/nevosegal/repos","events_url":"https://api.github.com/users/nevosegal/events{/privacy}","received_events_url":"https://api.github.com/users/nevosegal/received_events","type":"User","site_admin":false},"milestone":null,"comments":7,"created_at":"2014-10-01T15:47:37Z","updated_at":"2016-02-22T09:18:34Z","closed_at":null,"body":""},"comment":{"url":"https://api.github.com/repos/hughrawlinson/meyda/issues/comments/187085584","html_url":"https://github.com/hughrawlinson/meyda/issues/12#issuecomment-187085584","issue_url":"https://api.github.com/repos/hughrawlinson/meyda/issues/12","id":187085584,"user":{"login":"nevosegal","id":3370167,"avatar_url":"https://avatars.githubusercontent.com/u/3370167?v=3","gravatar_id":"","url":"https://api.github.com/users/nevosegal","html_url":"https://github.com/nevosegal","followers_url":"https://api.github.com/users/nevosegal/followers","following_url":"https://api.github.com/users/nevosegal/following{/other_user}","gists_url":"https://api.github.com/users/nevosegal/gists{/gist_id}","starred_url":"https://api.github.com/users/nevosegal/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/nevosegal/subscriptions","organizations_url":"https://api.github.com/users/nevosegal/orgs","repos_url":"https://api.github.com/users/nevosegal/repos","events_url":"https://api.github.com/users/nevosegal/events{/privacy}","received_events_url":"https://api.github.com/users/nevosegal/received_events","type":"User","site_admin":false},"created_at":"2016-02-22T09:18:34Z","updated_at":"2016-02-22T09:18:34Z","body":"OK, so I've checked and it is possible to compute it using an FFT, and even simpler using the IFFT of a power spectrum (see [this question on stackoverflow](http://stackoverflow.com/a/3950398/2065922)). The only problem we have is that we only only compute the power spectrum on half of the amplitude spectrum (up to the nyquist), which is problematic for ACF. We should consider passing the full amplitude spectrum to the extractors. We'll probably have to change some for loops but other than that I don't see an issue with doing this."}}