From 5e4e595a68b916f394c82adfc40589c8936238e7 Mon Sep 17 00:00:00 2001
From: David Hendriks <davidhendriks93@gmail.com>
Date: Tue, 8 Jun 2021 18:27:43 +0100
Subject: [PATCH] Updated explanation
---
binarycpython/utils/grid_options_defaults.py | 33 ++++++++++----------
1 file changed, 16 insertions(+), 17 deletions(-)
diff --git a/binarycpython/utils/grid_options_defaults.py b/binarycpython/utils/grid_options_defaults.py
index 8b7f14c1c..c7f1a1077 100644
--- a/binarycpython/utils/grid_options_defaults.py
+++ b/binarycpython/utils/grid_options_defaults.py
@@ -606,12 +606,18 @@ e.g. [1,0,0,0] for single stars only
defaults to [1,1,0,0] i.e. singles and binaries
""",
"normalize_multiplicities": """
-given a mix of multiplities, you can either (noting that
-here (S,B,T,Q) = appropriate modulator * model(S,B,T,Q) )
-
-'norm' : normalize so the whole population is 1.0
- after implementing the appropriate fractions
- S/(S+B+T+Q), B/(S+B+T+Q), T/(S+B+T+Q), Q/(S+B+T+Q)
+'norm': normalize so the whole population is 1.0
+ after implementing the appropriate fractions
+ S/(S+B+T+Q), B/(S+B+T+Q), T/(S+B+T+Q), Q/(S+B+T+Q)
+ given a mix of multiplities, you can either (noting that
+ here (S,B,T,Q) = appropriate modulator * model(S,B,T,Q) )
+ note: if you only set one multiplicity_modulator
+ to 1, and all the others to 0, then normalizing
+ will mean that you effectively have the same number
+ of stars as single, binary, triple or quad (whichever
+ is non-zero) i.e. the multiplicity fraction is ignored.
+ This is probably not useful except for
+ testing purposes or comparing to old grids.
'raw' : stick to what is predicted, i.e.
S/(S+B+T+Q), B/(S+B+T+Q), T/(S+B+T+Q), Q/(S+B+T+Q)
@@ -625,19 +631,12 @@ here (S,B,T,Q) = appropriate modulator * model(S,B,T,Q) )
...
*** this is canonical binary population synthesis ***
+ It only takes the maximum multiplicity into account,
+ i.e. it doesn't multiply the resulting array by the multiplicity modulator again.
+ This prevents the resulting array to always be 1 if only 1 multiplicity modulator element is nonzero
+
Note: if multiplicity_modulator == [1,1,1,1] this
option does nothing (equivalent to 'raw').
-
-Note: If you only set one multiplicity modulator to 1, and all others to zero,
-we will not multiply the fractions by the modulator. The grid will run fine (i.e. it will only run e.g. singles), but it will still take into account the real fraction
-This is unlike how this setting was previously implemented: normalizing
-will mean that you effectively have the same number
-of stars as single, binary, triple or quad (whichever
-is non-zero) i.e. the multiplicity fraction is ignored.
-
-
-
-
""",
"q_low_extrapolation_method": """
q extrapolation (below 0.15) method
--
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