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Tutorial in CosmoMC
 
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R Purnalingam



Joined: 03 Mar 2017
Posts: 3
Affiliation: IIT KANPUR

PostPosted: March 03 2017  Reply with quote

Hi everyone,

I am learning CosmoMc to get best parameter fit to my model of CMB tempertaure Data(Planck Data).My model includes 3 user defined parameters and 6 cosmological parameters as in Lambda-CDM model.So I need to make a best fit of 9 parameters.As I am new how to use cosmoMC, Can u suggest a basic tutorial of CosmoMC.I have installed it and compiled it and it compiled without any errors.What to do next?

Thanks in Advance!!

Purnalingam
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Erick Almaraz



Joined: 10 Jun 2012
Posts: 24
Affiliation: University of Mexico

PostPosted: March 03 2017  Reply with quote

Check out Antonio Cuesta's slides

Just google Antonio Cuesta CosmoMC
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R Purnalingam



Joined: 03 Mar 2017
Posts: 3
Affiliation: IIT KANPUR

PostPosted: March 04 2017  Reply with quote

I have seen all the three power points.I have some doubts.

1. What is the difference in parameter extraction with (action=0) and (action=2).

2.There is no params.ini file in CosmoMC main directory.Only test.ini is present.

3.I am using planck likelihood and planck data.After building planck likelihood I get a file named test_planck.ini. When I try compiling cosmomc using this file I get errors.

4.What does building plank likelihood actually do? Does it just take plank data or is the likelihood function is itself different?

5.For adding my own parameters,I have edited my camb code.Where should i edit my CosmoMC code?

Thanks in advance !!
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R Purnalingam



Joined: 03 Mar 2017
Posts: 3
Affiliation: IIT KANPUR

PostPosted: March 04 2017  Reply with quote

One more thing,
what is the difference between disttest.ini and distparams.ini
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Antony Lewis



Joined: 23 Sep 2004
Posts: 1185
Affiliation: University of Sussex

PostPosted: March 04 2017  Reply with quote

What the different action options do is described in the readme:

http://cosmologist.info/cosmomc/readme.html
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Bob Zou



Joined: 21 Jul 2016
Posts: 1
Affiliation: Beijing Institute of Technology

PostPosted: March 15 2017  Reply with quote

Hi, everyone
I have followed Antonio Cuesta's tutorial "Cosmology with CosmoMC
Solution to Exercises" , succeed in running a parameterization=background case. The tutorial is so good, thanks @Antonio Cuesta.
My question is about function "rombint" used in Planckprior.f90, chapter "Extra exercise: Background parameterization" of Antonio Cuesta's tutorial , which is the Romberg method for integration. In the module calling "rombint", I have not found the defination of function “rombint”, neither in the modules Planckprior.f90 used. But the integration works well, giving right values every time when called. I do not understand How and where CosmoMC call function "rombint".

Thanks for replying.
Good Luck.
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Antony Lewis



Joined: 23 Sep 2004
Posts: 1185
Affiliation: University of Sussex

PostPosted: March 15 2017  Reply with quote

It's in CAMB (subroutines.f90).
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