MAINT: Add parameter checks to polynomial integration functions.

It was not being checked that the `lbnd` and `scl` parameters were
scalars as required.

Closes #9901.

1 files changed, 6 insertions, 1 deletions

diff --git a/numpy/polynomial/polynomial.py b/numpy/polynomial/polynomial.py
index 1be775f6a..a71e5b549 100644
--- a/numpy/polynomial/polynomial.py
+++ b/numpy/polynomial/polynomial.py
@@ -608,7 +608,8 @@ def polyint(c, m=1, k=[], lbnd=0, scl=1, axis=0):
     Raises
     ------
     ValueError
-        If ``m < 1``, ``len(k) > m``.
+        If ``m < 1``, ``len(k) > m``, ``np.ndim(lbnd) != 0``, or
+        ``np.ndim(scl) != 0``.
 
     See Also
     --------
@@ -654,6 +655,10 @@ def polyint(c, m=1, k=[], lbnd=0, scl=1, axis=0):
         raise ValueError("The order of integration must be non-negative")
     if len(k) > cnt:
         raise ValueError("Too many integration constants")
+    if np.ndim(lbnd) != 0:
+        raise ValueError("lbnd must be a scalar.")
+    if np.ndim(scl) != 0:
+        raise ValueError("scl must be a scalar.")
     if iaxis != axis:
         raise ValueError("The axis must be integer")
     iaxis = normalize_axis_index(iaxis, c.ndim)