dfm/emcee — pull request #120 by joezuntz (2014-06-16 11:40:14+00:00)
Title: Added a sample_ellipsoid function

In problems with strong covariances it can speed burn-in quite a bit to initialize walker positions more carefully than emcee.utils.sample_ball allows. This new function can be used to initalize a collection of walkers with a specified mean and covariance.