Mixing ranges and sets

Ranges and sets can be specified together, and there is no limit to the number of ranges or sets that can be specified on the command line, or in the grid file.

Running COMPAS with the command:

./COMPAS --metallicity r[0.0001,5,0.0013] --common-envelope-alpha s[0.1,0.2,0.6,0.9]

would result in 20 binaries being evolved: 5 for the range of metallicities, times 4 for the set of CE alpha values.

Consider the following grid file, named gridfile.txt:

--metallicity r[0.0001,5,0.0013] --common-envelope-alpha s[0.1,0.2,0.6,0.9]
--fryer-supernova-engine s[rapid,delayed] --eccentricity r[0.0001,3,0.0003]

Running COMPAS with the command:

./COMPAS --grid gridfile.txt

would result in 26 binaries being evolved:

• 20 for the first grid line (5 for the range of metallicities, times 4 for the set of CE alpha values), and
  

• 6 for the second grid line (2 for the set of Fryer SN engine values, and 3 for the range of eccentricities)

Running COMPAS with the command:

./COMPAS --remnant-mass-prescription s[mullermandel,fryer2012,hurley2000,muller2016] --grid gridfile.txt

would result in 104 binaries being evolved: the grid file would be ‘executed’ for each of the four remnant mass prescriptions specified on the command line.

Multiple ranges and/or sets can be specified on the command line, and on each line of the grid file – so very large numbers of stars/binaries can be evolved with just a few range/set specifications.