From ae56ef1fdb651122c8107c2590fc41db9368ffa2 Mon Sep 17 00:00:00 2001
From: Zeitsperre <10819524+Zeitsperre@users.noreply.github.com>
Date: Tue, 23 Jan 2024 17:49:46 -0500
Subject: [PATCH] use first element of residual in _nonpolyfit_1d

---
 xarray/core/nputils.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xarray/core/nputils.py b/xarray/core/nputils.py
index 7fcd4b34d95..0151d715f6f 100644
--- a/xarray/core/nputils.py
+++ b/xarray/core/nputils.py
@@ -234,7 +234,7 @@ def _nanpolyfit_1d(arr, x, rcond=None):
     mask = np.isnan(arr)
     if not np.all(mask):
         out[:-1], resid, rank, _ = np.linalg.lstsq(x[~mask, :], arr[~mask], rcond=rcond)
-        out[-1] = resid if resid.size > 0 else np.nan
+        out[-1] = resid[0] if resid.size > 0 else np.nan
         warn_on_deficient_rank(rank, x.shape[1])
     return out