From 86887a6c34fcb7fb7b88d30108986ca3e62c8dce Mon Sep 17 00:00:00 2001
From: Bounty Hunter <n6085530@gmail.com>
Date: Tue, 23 Jun 2026 01:22:23 +0000
Subject: [PATCH] Fix: handle num=1 in RangeIndex.linspace to match numpy
 behavior

When num=1, RangeIndex.linspace raised ZeroDivisionError because it
divided by (num - 1). NumPy's linspace returns a single-element array
at the start value in this case. This fix aligns the behavior.

Fixes #11397
---
 xarray/indexes/range_index.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/xarray/indexes/range_index.py b/xarray/indexes/range_index.py
index 4f8d52f6510..37a0e8a51d9 100644
--- a/xarray/indexes/range_index.py
+++ b/xarray/indexes/range_index.py
@@ -347,7 +347,9 @@ def linspace(
         if coord_name is None:
             coord_name = dim
 
-        if endpoint:
+        if num == 1:
+            stop = start
+        elif endpoint:
             stop += (stop - start) / (num - 1)
 
         transform = RangeCoordinateTransform(