From 9a170e648bcce01a7d4ac2f3e6222ac969ec223d Mon Sep 17 00:00:00 2001
From: Wes Kitlasten <w.kitlasten@gns.cri.nz>
Date: Sun, 1 May 2022 12:21:16 +1200
Subject: [PATCH] copy of ret_df to avoid fragmented df warning, not sure it
 speeds anything up though

---
 pyemu/utils/metrics.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pyemu/utils/metrics.py b/pyemu/utils/metrics.py
index 5bc46199b..9a2501791 100644
--- a/pyemu/utils/metrics.py
+++ b/pyemu/utils/metrics.py
@@ -326,4 +326,6 @@ def calc_metric_ensemble(
                 ret_df["{}_{}".format(cm.upper(), cg)] = [
                     f(ens.loc[i][cnames], obs.loc[cnames].obsval) for i in ret_df.index
                 ]
+        ret_df = ret_df.copy()
+
     return ret_df