Random error in get_cmb_power_spectra ?

Use of Healpix, camb, CLASS, cosmomc, compilers, etc.
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Felipe Maldonado
Posts: 9
Joined: November 10 2016
Affiliation: FSU

Random error in get_cmb_power_spectra ?

Post by Felipe Maldonado » September 06 2017

Hello,
Is there any reason to expect get_cmb_power_spectra to return power spectra with slightly different values each run (same cosmology)?

I've observed a difference of the order of 1E-9 %, which is of course, minuscule, but I'd like to know if this is expected of CAMB or I did something to cause it.

Thank you very much,
Felipe

Antony Lewis
Posts: 1363
Joined: September 23 2004
Affiliation: University of Sussex
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Re: Random error in get_cmb_power_spectra ?

Post by Antony Lewis » September 06 2017

You can expect small variations from things like random timing variations in the OpenMP threading.

Felipe Maldonado
Posts: 9
Joined: November 10 2016
Affiliation: FSU

Random error in get_cmb_power_spectra ?

Post by Felipe Maldonado » September 07 2017

Thank you for the clarification.
Felipe

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