PERF: Fix regression

Author: Jacob-Stevens-Haas

pysindy/differentiation/finite_difference.py

@@ -286,7 +286,11 @@ def _differentiate(
                     s[self.axis] = slice(start, stop)
                     interior = interior + x[tuple(s)] * coeffs[i]
         else:
-            t = AxesArray(np.array(t), axes={"ax_time": 0, "ax_coord": 1})
+            if not isinstance(t, AxesArray):
+                t = np.asarray(t)
+                if t.ndim == 1:
+                    t = t[:, np.newaxis]
+                t = AxesArray(t, axes={"ax_time": 0, "ax_coord": 1})
             coeffs = self._coefficients(t)
             interior = self._accumulate(coeffs, x)
         s[self.axis] = slice((self.n_stencil - 1) // 2, -(self.n_stencil - 1) // 2)