From d53f9d03587acd3fde7fea6f92c7a9c233625fa8 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Wed, 21 Jan 2026 21:47:35 +0000
Subject: [PATCH 1/5] Initial plan


From bca5c80ecddb077147c18a65e2dd330c69f11efe Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Wed, 21 Jan 2026 21:50:38 +0000
Subject: [PATCH 2/5] Add validation for G_new to check for non-positive values

Co-authored-by: The9Cat <25960766+The9Cat@users.noreply.github.com>
---
 EXP-units/__pycache__/expunits.cpython-312.pyc | Bin 0 -> 13864 bytes
 EXP-units/expunits.py                          |   6 +++++-
 2 files changed, 5 insertions(+), 1 deletion(-)
 create mode 100644 EXP-units/__pycache__/expunits.cpython-312.pyc

diff --git a/EXP-units/__pycache__/expunits.cpython-312.pyc b/EXP-units/__pycache__/expunits.cpython-312.pyc
new file mode 100644
index 0000000000000000000000000000000000000000..da7178dfb15bcfdef766c67057c0586c48e42122
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HcmV?d00001

diff --git a/EXP-units/expunits.py b/EXP-units/expunits.py
index 196a0d9..65d9395 100644
--- a/EXP-units/expunits.py
+++ b/EXP-units/expunits.py
@@ -106,6 +106,10 @@ def compute_scales(G_old, G_new, s_L, s_V, s_M):
     s_L, s_V, s_M are either floats or None.
     Returns (s_L, s_V, s_M). Raises ValueError if insufficient or inconsistent.
     """
+    # Validate G_new is physically meaningful
+    if G_new <= 0:
+        raise ValueError(f"G_new must be positive (got {G_new}). Zero or negative gravitational constants are not physically meaningful.")
+    
     known = [(s_L is not None), (s_V is not None), (s_M is not None)]
     n_known = sum(known)
 
@@ -114,7 +118,7 @@ def compute_scales(G_old, G_new, s_L, s_V, s_M):
         G_check = (s_L * s_V**2) / (G_old * s_M)
         if not math.isfinite(G_check):
             raise ValueError("Computed G_check is not finite.")
-        if abs((G_check - G_new) / (abs(G_new) if G_new != 0 else 1.0)) > 1e-9:
+        if abs((G_check - G_new) / abs(G_new)) > 1e-9:
             raise ValueError(f"Inconsistent scales: G_new requested {G_new} but scales give {G_check}.")
         return s_L, s_V, s_M
 

From 744705a524148716b592e77ca7bfd6f82ac859c7 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Wed, 21 Jan 2026 21:50:50 +0000
Subject: [PATCH 3/5] Add __pycache__ to .gitignore and remove cached files

Co-authored-by: The9Cat <25960766+The9Cat@users.noreply.github.com>
---
 .gitignore                                     |   1 +
 EXP-units/__pycache__/expunits.cpython-312.pyc | Bin 13864 -> 0 bytes
 2 files changed, 1 insertion(+)
 delete mode 100644 EXP-units/__pycache__/expunits.cpython-312.pyc

diff --git a/.gitignore b/.gitignore
index 314ca4c..4fcac03 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@ Binary/*run1*
 
 DiskHaloA/*run0*
 DiskHaloA/processor.rates
+__pycache__/
diff --git a/EXP-units/__pycache__/expunits.cpython-312.pyc b/EXP-units/__pycache__/expunits.cpython-312.pyc
deleted file mode 100644
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From 83cde979d9aa254e6cbf6e3daf7c4c3bf1b2923f Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Wed, 21 Jan 2026 21:51:37 +0000
Subject: [PATCH 4/5] Add validation for G_old to prevent division errors

Co-authored-by: The9Cat <25960766+The9Cat@users.noreply.github.com>
---
 EXP-units/expunits.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/EXP-units/expunits.py b/EXP-units/expunits.py
index 65d9395..513ef23 100644
--- a/EXP-units/expunits.py
+++ b/EXP-units/expunits.py
@@ -109,6 +109,8 @@ def compute_scales(G_old, G_new, s_L, s_V, s_M):
     # Validate G_new is physically meaningful
     if G_new <= 0:
         raise ValueError(f"G_new must be positive (got {G_new}). Zero or negative gravitational constants are not physically meaningful.")
+    if G_old <= 0:
+        raise ValueError(f"G_old must be positive (got {G_old}). Zero or negative gravitational constants are not physically meaningful.")
     
     known = [(s_L is not None), (s_V is not None), (s_M is not None)]
     n_known = sum(known)

From c28a276bacadabb5eb184eae0eaf37c513fe07ac Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Wed, 21 Jan 2026 21:52:26 +0000
Subject: [PATCH 5/5] Simplify division by G_new since it's guaranteed positive

Co-authored-by: The9Cat <25960766+The9Cat@users.noreply.github.com>
---
 EXP-units/expunits.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/EXP-units/expunits.py b/EXP-units/expunits.py
index 513ef23..1536a63 100644
--- a/EXP-units/expunits.py
+++ b/EXP-units/expunits.py
@@ -120,7 +120,7 @@ def compute_scales(G_old, G_new, s_L, s_V, s_M):
         G_check = (s_L * s_V**2) / (G_old * s_M)
         if not math.isfinite(G_check):
             raise ValueError("Computed G_check is not finite.")
-        if abs((G_check - G_new) / abs(G_new)) > 1e-9:
+        if abs((G_check - G_new) / G_new) > 1e-9:
             raise ValueError(f"Inconsistent scales: G_new requested {G_new} but scales give {G_check}.")
         return s_L, s_V, s_M