Hi,
i've a problem trying to use cosmomc for estimate helium abundance with mock data. I modified source code to add a new parameter (he4) and i run a single chain with a prior on he4 but after a few hundred of points chain stops with the following message
updating proposal density
Proposal matrix has negative or zero eigenvalues
can anyone help me
thanks a lot,
Andrea
chains with he4
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- Posts: 7
- Joined: September 27 2008
- Affiliation: Università La Sapienza