CosmoMC: running spectral index and other questions

Use of Cobaya. camb, CLASS, cosmomc, compilers, etc.
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Deepak Vaid
Posts: 7
Joined: May 24 2007
Affiliation: Penn State

CosmoMC: running spectral index and other questions

Post by Deepak Vaid » June 28 2007

Hi,

I have a few questions. I'm running cosmomc with the params_h.f90 parametrization. I let the running of the spectral index vary in the params.ini file. However I don't find any output files which contain the values for n_run generated by cosmomc. Where can I find this info?

In cosmomc, the num_cls parameters in cmbtypes.f90 can be used to determine whether only TT is used or TT, TE, EE etc. Would setting num_cls = 2 make cosmomc use only the TT and TE data? (This is not clear from the cosmomc readme.)

How can I determine the effective chi-square and reduced chi-square values for my runs?

Antony Lewis
Posts: 1941
Joined: September 23 2004
Affiliation: University of Sussex
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Re: CosmoMC: running spectral index and other questions

Post by Antony Lewis » July 20 2007

The running is output in the chains as parameter 10 - see the Readme (I think this is the same in params_H).

I think you can't easily run it with just TT and TE, though I've not tried.

Deepak Vaid
Posts: 7
Joined: May 24 2007
Affiliation: Penn State

CosmoMC: running spectral index and other questions

Post by Deepak Vaid » July 20 2007

Thanks Antony. Yes I figured out how to get n_run. That was just stupidity on my part.

The TT/TE part is what was puzzling us and clears up a lot of things.

Thanks again.

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