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baudren / montepython_public

Public repository for the Monte Python Code
MIT License
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getting a nan value for sigma of cosmological parameters in using montepython #78

Closed mahtaparsa closed 6 years ago

mahtaparsa commented 7 years ago

Dear all, When I use montepython for constraining the cosmological parameters, a nan value for sigma, 1-sigma, 2-sigma, ... would appear, and in likelihood diagrams there is "+nan" value for sigma related to cosmo, nuisance (usually for Planck data), or derived parameters. I can not understand what is the problem. Thanks your suggestions.

ivandebono commented 6 years ago

The problem it your chains have not converged. Either because you haven't sampled enough points (you set the number using the -N setting), or for a variety of reasons, such as poor constraints from the data or parameter degeneracy.