MAINT: Ragged cleanup (#15085)

* TST: refactor sorter tests, use proper ragged array creation syntax

* MAINT: code never hit the exception, but would error when iterating

* MAINT: pytest.mark.parametrize did not add much, removing (from review)

* MAINT: use asanyarray and generalize (from review)

Co-authored-by: Eric Wieser <wieser.eric@gmail.com>

1 files changed, 5 insertions, 7 deletions

diff --git a/numpy/polynomial/polyutils.py b/numpy/polynomial/polyutils.py
index b65e88a83..9b8e9fc42 100644
--- a/numpy/polynomial/polyutils.py
+++ b/numpy/polynomial/polyutils.py
@@ -540,17 +540,15 @@ def _valnd(val_f, c, *args):
     c, args :
         See the ``<type>val<n>d`` functions for more detail
     """
-    try:
-        args = tuple(np.array(args, copy=False))
-    except Exception:
-        # preserve the old error message
-        if len(args) == 2:
+    args = [np.asanyarray(a) for a in args]
+    shape0 = args[0].shape
+    if not all((a.shape == shape0 for a in args[1:])):
+        if len(args) == 3:
             raise ValueError('x, y, z are incompatible')
-        elif len(args) == 3:
+        elif len(args) == 2:
             raise ValueError('x, y are incompatible')
         else:
             raise ValueError('ordinates are incompatible')
-
     it = iter(args)
     x0 = next(it)