{"action":"opened","issue":{"url":"https://api.github.com/repos/flatironinstitute/NoRMCorre/issues/18","repository_url":"https://api.github.com/repos/flatironinstitute/NoRMCorre","labels_url":"https://api.github.com/repos/flatironinstitute/NoRMCorre/issues/18/labels{/name}","comments_url":"https://api.github.com/repos/flatironinstitute/NoRMCorre/issues/18/comments","events_url":"https://api.github.com/repos/flatironinstitute/NoRMCorre/issues/18/events","html_url":"https://github.com/flatironinstitute/NoRMCorre/issues/18","id":342417845,"node_id":"MDU6SXNzdWUzNDI0MTc4NDU=","number":18,"title":"Motion_metrics giving different results for same data set ","user":{"login":"vd2309","id":19959418,"node_id":"MDQ6VXNlcjE5OTU5NDE4","avatar_url":"https://avatars3.githubusercontent.com/u/19959418?v=4","gravatar_id":"","url":"https://api.github.com/users/vd2309","html_url":"https://github.com/vd2309","followers_url":"https://api.github.com/users/vd2309/followers","following_url":"https://api.github.com/users/vd2309/following{/other_user}","gists_url":"https://api.github.com/users/vd2309/gists{/gist_id}","starred_url":"https://api.github.com/users/vd2309/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/vd2309/subscriptions","organizations_url":"https://api.github.com/users/vd2309/orgs","repos_url":"https://api.github.com/users/vd2309/repos","events_url":"https://api.github.com/users/vd2309/events{/privacy}","received_events_url":"https://api.github.com/users/vd2309/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2018-07-18T17:14:27Z","updated_at":"2018-07-18T17:14:27Z","closed_at":null,"author_association":"NONE","body":"Hello, \r\n\r\nWe are using NormCorre and are checking our results on different computers. Each time we use a different computer with the same exact data set we are getting different results. We have identified the issue as a problem with the corr function. \r\nAccording to our debugging, the corr(X,Y) function gives very different results when you loop through each column of the matrix i.e. call the corr function for each column and calculate corr(X(:,i), Y) at each column of X, versus when you just call the corr function once on the entire X matrix and Y. \r\n\r\nWe believe that this problem is what is leading to the different results for the same data set. \r\n\r\nHave you experienced this problem and are there any solutions? Or did you already know this about the corr function and specifically chose to call it once on the entire matrix instead of looping through?\r\n\r\nThank you very much for you help!\r\n\r\nGinny \r\nRichard Axel Laboratory\r\n\r\n\r\n\r\n\r\n"}}
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