CosmoMC:3D scatter plot

Use of Cobaya. camb, CLASS, cosmomc, compilers, etc.
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gongbo zhao
Posts: 73
Joined: January 04 2005
Affiliation: NAOC
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CosmoMC:3D scatter plot

Post by gongbo zhao » August 15 2006

Dear all,
When I output the 3-D scatter plot I find the dots are very sparse. (Chains are converged and there are sufficient chain elements.) How can I increase the dots to refine the plot?
Many thanks.

Best,
Gong-Bo Zhao

Antony Lewis
Posts: 1941
Joined: September 23 2004
Affiliation: University of Sussex
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Re: CosmoMC:3D scatter plot

Post by Antony Lewis » August 15 2006

By default it uses at most 2000 points. You can override this by using e.g. in distparams.ini

make_single_samples = T
single_thin = 1

which will use as many samples as available (no thinning).

However you can be converged for mean values without having enough samples to make good scatter plots. Try running longer to get more samples - e.g. use a more stringent test of limit convergence in params.ini:

MPI_Check_Limit_Converge = T
MPI_Limit_Converge = 0.025
MPI_Limit_Converge_Err = 0.3

gongbo zhao
Posts: 73
Joined: January 04 2005
Affiliation: NAOC
Contact:

CosmoMC:3D scatter plot

Post by gongbo zhao » August 16 2006

Hi,Antony,
Thanks very much for your reply.

Cheers
Gong-Bo Zhao

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