{"action":"created","issue":{"url":"https://api.github.com/repos/ContinuumIO/anaconda-issues/issues/425","labels_url":"https://api.github.com/repos/ContinuumIO/anaconda-issues/issues/425/labels{/name}","comments_url":"https://api.github.com/repos/ContinuumIO/anaconda-issues/issues/425/comments","events_url":"https://api.github.com/repos/ContinuumIO/anaconda-issues/issues/425/events","html_url":"https://github.com/ContinuumIO/anaconda-issues/issues/425","id":103777954,"number":425,"title":"Lambert W function in Scipy 0.16.0 on Linux returns NaN","user":{"login":"bryanwweber","id":4396228,"avatar_url":"https://avatars.githubusercontent.com/u/4396228?v=3","gravatar_id":"","url":"https://api.github.com/users/bryanwweber","html_url":"https://github.com/bryanwweber","followers_url":"https://api.github.com/users/bryanwweber/followers","following_url":"https://api.github.com/users/bryanwweber/following{/other_user}","gists_url":"https://api.github.com/users/bryanwweber/gists{/gist_id}","starred_url":"https://api.github.com/users/bryanwweber/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bryanwweber/subscriptions","organizations_url":"https://api.github.com/users/bryanwweber/orgs","repos_url":"https://api.github.com/users/bryanwweber/repos","events_url":"https://api.github.com/users/bryanwweber/events{/privacy}","received_events_url":"https://api.github.com/users/bryanwweber/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":1,"created_at":"2015-08-28T19:08:27Z","updated_at":"2015-10-03T16:49:53Z","closed_at":null,"body":"The `lambertw` function in Scipy 0.16.0 for Python 3.4.3 returns NaN, no matter the input value. This only happens for Linux (I tested on Ubuntu 14.04), no problems on Windows. Furthermore, building `numpy` and `scipy` myself resolves the issue. The `lambertw` tests in scipy also fail. See also: http://stackoverflow.com/questions/30792319/anaconda3-scipy-special-lambertw-function-return-nan\r\n\r\n    $ conda info\r\n    Current conda install:\r\n    \r\n                 platform : linux-64\r\n            conda version : 3.16.0\r\n      conda-build version : 1.17.0\r\n           python version : 3.4.3.final.0\r\n    \r\n    $ ipython\r\n    \r\n    In [1]: import scipy\r\n    \r\n    In [2]: scipy.__version__\r\n    Out[2]: '0.16.0'\r\n    \r\n    In [3]: import numpy\r\n    \r\n    In [4]: numpy.__version__\r\n    Out[4]: '1.9.2'\r\n    \r\n    In [5]: from scipy.special import lambertw\r\n    \r\n    In [6]: lambertw(1.0)\r\n    Out[6]: (nan+0j)\r\n    "},"comment":{"url":"https://api.github.com/repos/ContinuumIO/anaconda-issues/issues/comments/145264101","html_url":"https://github.com/ContinuumIO/anaconda-issues/issues/425#issuecomment-145264101","issue_url":"https://api.github.com/repos/ContinuumIO/anaconda-issues/issues/425","id":145264101,"user":{"login":"bryanwweber","id":4396228,"avatar_url":"https://avatars.githubusercontent.com/u/4396228?v=3","gravatar_id":"","url":"https://api.github.com/users/bryanwweber","html_url":"https://github.com/bryanwweber","followers_url":"https://api.github.com/users/bryanwweber/followers","following_url":"https://api.github.com/users/bryanwweber/following{/other_user}","gists_url":"https://api.github.com/users/bryanwweber/gists{/gist_id}","starred_url":"https://api.github.com/users/bryanwweber/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bryanwweber/subscriptions","organizations_url":"https://api.github.com/users/bryanwweber/orgs","repos_url":"https://api.github.com/users/bryanwweber/repos","events_url":"https://api.github.com/users/bryanwweber/events{/privacy}","received_events_url":"https://api.github.com/users/bryanwweber/received_events","type":"User","site_admin":false},"created_at":"2015-10-03T16:49:53Z","updated_at":"2015-10-03T16:49:53Z","body":"This issue is still occurring on Linux. Is there any progress or update to fixing it?"}}