Public bug reported:
Ubuntu release: 19.04
---
Package Info:
python3-healpy:
Installed: 1.12.8-8
Candidate: 1.12.8-8
Version table:
*** 1.12.8-8 500
500 http://de.archive.ubuntu.com/ubuntu disco/universe amd64 Packages
100 /var/lib/dpkg/status
---
Expectation:
When importing healpy in python and calling the function synfast, I expect it
to produce different maps of the CMB from the same cl each time it is called
since randomization is used to produce alms.
Actual Behaviour:
The same map is produced each time the function is called. This is incorrect
from a Physics perspective, since there is no unique way to produce a CMB from
one given cl.
Reason:
In the 'sphtfunc.py' file, located in the healpy directory, in lines 525 and
526, a seed is set for the numpy randomization function which gives the same
output every time. These lines should be removed.
NOTE: This is not the case in the source files, but when healpy is installed
via this package it is there, probably from debugging.
** Affects: healpy (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1839344
Title:
Function 'synfast' in 'sphtfunc.py' doesn't randomize when producing
alms
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