Using Montepythin covmat with Cobaya

Use of Cobaya. camb, CLASS, cosmomc, compilers, etc.
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Tristan L Smith
Posts: 24
Joined: November 14 2005
Affiliation: Swarthmore
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Using Montepythin covmat with Cobaya

Post by Tristan L Smith » May 17 2022

Hello,

I am running Cobaya but would like to use an initial covmat produced by a Montepython run. When I try to just include it as the covmat, the run fails and I get the error:
is not a positive-definite, symmetric square matrix
. I know the covmat is positive definite, symmetric, and square (it comes from a very well converged MP run).

Any insights on why this error is occurring and how it may be addressed would be appreciated!

Best,
Tristan

Jesus Torrado
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Joined: April 15 2013
Affiliation: RWTH Aachen
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Re: Using Montepythin covmat with Cobaya

Post by Jesus Torrado » May 18 2022

Hi Tristan,

Can you post the matrix, please?

Ali Rida Khalife
Posts: 5
Joined: October 31 2022
Affiliation: Institut d'Astrophysique de Paris

Re: Using Montepythin covmat with Cobaya

Post by Ali Rida Khalife » January 30 2023

Hello Tristan and Jesus!
I'm having the same problem. Did anyone manage to identify the problem and its solution?
Thanks!

Antony Lewis
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Joined: September 23 2004
Affiliation: University of Sussex
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Re: Using Montepythin covmat with Cobaya

Post by Antony Lewis » January 30 2023

My guess would be differences between parameter names. But please provide a full test case if it seems it is consistent and should work.

Ali Rida Khalife
Posts: 5
Joined: October 31 2022
Affiliation: Institut d'Astrophysique de Paris

Re: Using Montepythin covmat with Cobaya

Post by Ali Rida Khalife » February 02 2023

Yes that was the issue. Thanks a lot!

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