From 92ccd35b3087280c94e6a88e8671164cbc8682be Mon Sep 17 00:00:00 2001
From: Younes Strittmatter <younes_strittmatter@brown.edu>
Date: Thu, 17 Aug 2023 15:56:42 -0400
Subject: [PATCH] bug: make iv and dvs obligatory/ add noise only to output

---
 .../experiment_runner/synthetic/abstract/equation/__init__.py    | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/autora/experiment_runner/synthetic/abstract/equation/__init__.py b/src/autora/experiment_runner/synthetic/abstract/equation/__init__.py
index 68231c0..4f190bc 100644
--- a/src/autora/experiment_runner/synthetic/abstract/equation/__init__.py
+++ b/src/autora/experiment_runner/synthetic/abstract/equation/__init__.py
@@ -124,6 +124,7 @@ def experiment_runner(
         """A function which simulates noisy observations."""
         x = conditions
         if isinstance(x, pd.DataFrame):
+            x = x.copy()
             if not set([el.name for el in args]).issubset(x.columns):
                 raise Exception(
                     f"Variables of expression {expression} "