chains with he4

Use of Healpix, camb, CLASS, cosmomc, compilers, etc.
Post Reply
Andrea Maselli
Posts: 7
Joined: September 27 2008
Affiliation: Università La Sapienza

chains with he4

Post by Andrea Maselli » July 14 2009

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

Post Reply