From c34ef8a60227720724e90aa11a6266c0026a812a Mon Sep 17 00:00:00 2001
From: Mick <43316012+headtr1ck@users.noreply.github.com>
Date: Thu, 12 May 2022 21:01:58 +0200
Subject: [PATCH] change polyval dim ordering (#6601)

---
 xarray/core/computation.py       | 2 +-
 xarray/tests/test_computation.py | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/xarray/core/computation.py b/xarray/core/computation.py
index 8d450cceef9..81b5e3fd915 100644
--- a/xarray/core/computation.py
+++ b/xarray/core/computation.py
@@ -1909,7 +1909,7 @@ def polyval(
 
     # using Horner's method
     # https://en.wikipedia.org/wiki/Horner%27s_method
-    res = coeffs.isel({degree_dim: max_deg}, drop=True) + zeros_like(coord)
+    res = zeros_like(coord) + coeffs.isel({degree_dim: max_deg}, drop=True)
     for deg in range(max_deg - 1, -1, -1):
         res *= coord
         res += coeffs.isel({degree_dim: deg}, drop=True)
diff --git a/xarray/tests/test_computation.py b/xarray/tests/test_computation.py
index b8aa05c75e7..ec8b5a5bc7c 100644
--- a/xarray/tests/test_computation.py
+++ b/xarray/tests/test_computation.py
@@ -1951,7 +1951,7 @@ def test_where_attrs() -> None:
             xr.DataArray(
                 [[0, 1], [0, 1]], dims=("y", "degree"), coords={"degree": [0, 1]}
             ),
-            xr.DataArray([[1, 2, 3], [1, 2, 3]], dims=("y", "x")),
+            xr.DataArray([[1, 1], [2, 2], [3, 3]], dims=("x", "y")),
             id="broadcast-x",
         ),
         pytest.param(