From 0751aeb9b2bec93fb6fa4d98638a710803e1500c Mon Sep 17 00:00:00 2001
From: Isuru Fernando <isuruf@gmail.com>
Date: Fri, 5 Oct 2018 12:40:32 -0500
Subject: [PATCH] Add a comment
---
sumpy/expansion/__init__.py | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/sumpy/expansion/__init__.py b/sumpy/expansion/__init__.py
index 480f53fc..647ebb01 100644
--- a/sumpy/expansion/__init__.py
+++ b/sumpy/expansion/__init__.py
@@ -458,6 +458,12 @@ class LinearRecurrenceBasedExpansionTermsWrangler(ExpansionTermsWrangler):
def get_reduced_coeffs(self, nullspace):
"""
Returns the indices of the reduced set of derivatives which are stored.
+ Override this method if the reduced set is known analytically.
+
+ This method does elementary row operations to figure out which rows are
+ linearly dependent on the previous rows. Partial pivoting is not done
+ to preserve the order so that a row is not linearly dependent on a row
+ that came after in the original row order.
"""
mat = nullspace.copy()
nrows = mat.shape[0]
--
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