From ae1add8777828b879301aa59d3a9680dcbfab502 Mon Sep 17 00:00:00 2001
From: Ken Kehoe <kkehoe@ou.edu>
Date: Thu, 21 Dec 2023 10:51:17 -0700
Subject: [PATCH] Catching divide by 0 error before it errors. (#780)

---
 act/qc/radiometer_tests.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/act/qc/radiometer_tests.py b/act/qc/radiometer_tests.py
index bc34d7b0b2..34ba7687c2 100644
--- a/act/qc/radiometer_tests.py
+++ b/act/qc/radiometer_tests.py
@@ -262,7 +262,11 @@ def fft_shading_test_process(
             # Calculates to the left/right of each peak
             peak_l = max(fftv[range(sind, index[0])])
             peak_r = max(fftv[range(index[-1], eind)])
-            ratio.append(peak / np.mean([peak_l, peak_r]))
+            mean_value = np.mean([peak_l, peak_r])
+            if mean_value == 0.0:
+                ratio.append(np.nan)
+            else:
+                ratio.append(peak / mean_value)
 
     # Checks ratios against thresholds for each freq range
     shading = 0