From 6e01d2d0d1b3b29b932ea8c6613b36283c748c9b Mon Sep 17 00:00:00 2001
From: Hao Gao <gaohao95@gmail.com>
Date: Mon, 10 Sep 2018 08:16:54 -0500
Subject: [PATCH] Return a new object in replace_inner_kernel
---
sumpy/kernel.py | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/sumpy/kernel.py b/sumpy/kernel.py
index 1ee007ad..3ce0bb8d 100644
--- a/sumpy/kernel.py
+++ b/sumpy/kernel.py
@@ -798,8 +798,7 @@ class AxisTargetDerivative(DerivativeBase):
return expr.diff(bvec[self.axis])
def replace_inner_kernel(self, new_inner_kernel):
- self.inner_kernel = new_inner_kernel
- return self
+ return type(self)(self.axis, new_inner_kernel)
mapper_method = "map_axis_target_derivative"
--
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