From b003ee1fb6764748517abfde7baca9bb1c786d99 Mon Sep 17 00:00:00 2001
From: Jan Kwakkel <j.h.kwakkel@tudelft.nl>
Date: Sun, 5 Mar 2023 22:00:20 +0100
Subject: [PATCH] fixes a bug where Prim modifies the experiments array (#228)

---
 ema_workbench/analysis/prim.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ema_workbench/analysis/prim.py b/ema_workbench/analysis/prim.py
index 8c90d6093..658de1f3b 100644
--- a/ema_workbench/analysis/prim.py
+++ b/ema_workbench/analysis/prim.py
@@ -978,6 +978,8 @@ def __init__(
         assert mode in {sdutil.RuleInductionType.BINARY, sdutil.RuleInductionType.REGRESSION}
         assert self._assert_mode(y, mode, update_function)
         # preprocess x
+        x = x.copy()
+
         try:
             x.drop(columns="scenario", inplace=True)
         except KeyError: