From 2e510337ccb62d272b013e5a4867aa11ed2e08b1 Mon Sep 17 00:00:00 2001
From: Shah Mahdi Hasan <tanweer.mahdi@gmail.com>
Date: Fri, 24 Nov 2023 11:51:30 +1100
Subject: [PATCH] Added "min" and "max" sympy mapping (#473)

* Added "min" and "max" sympy mapping

To overcome the sympy bug while using Min/Max operators as discussed under this issue: https://github.com/MilesCranmer/PySR/issues/183

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
---
 pysr/export_sympy.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pysr/export_sympy.py b/pysr/export_sympy.py
index 81142f48..e10609bd 100644
--- a/pysr/export_sympy.py
+++ b/pysr/export_sympy.py
@@ -47,6 +47,8 @@
     "ceil": sympy.ceiling,
     "sign": sympy.sign,
     "gamma": sympy.gamma,
+    "max": lambda x, y: sympy.Piecewise((y, x < y), (x, True)),
+    "min": lambda x, y: sympy.Piecewise((x, x < y), (y, True)),
 }