Hey all, We have a PR languishing that fixes np.irr to handle negative rate-of-returns: https://github.com/numpy/numpy/pull/4210 I don't even know what "IRR" stands for, and it seems rather confusing from the discussion there. Anyone who knows something about the issues is invited to speak up... -n -- Nathaniel J. Smith Postdoctoral researcher - Informatics - University of Edinburgh http://vorpus.org