Fixed database typo and removed unnecessary class identifier.

venv/Lib/site-packages/scipy/interpolate/interpnd_info.py

@@ -0,0 +1,37 @@
+"""
+Here we perform some symbolic computations required for the N-D
+interpolation routines in `interpnd.pyx`.
+
+"""
+from sympy import symbols, binomial, Matrix  # type: ignore[import]
+
+
+def _estimate_gradients_2d_global():
+
+    #
+    # Compute
+    #
+    #
+
+    f1, f2, df1, df2, x = symbols(['f1', 'f2', 'df1', 'df2', 'x'])
+    c = [f1, (df1 + 3*f1)/3, (df2 + 3*f2)/3, f2]
+
+    w = 0
+    for k in range(4):
+        w += binomial(3, k) * c[k] * x**k*(1-x)**(3-k)
+
+    wpp = w.diff(x, 2).expand()
+    intwpp2 = (wpp**2).integrate((x, 0, 1)).expand()
+
+    A = Matrix([[intwpp2.coeff(df1**2), intwpp2.coeff(df1*df2)/2],
+                [intwpp2.coeff(df1*df2)/2, intwpp2.coeff(df2**2)]])
+
+    B = Matrix([[intwpp2.coeff(df1).subs(df2, 0)],
+                [intwpp2.coeff(df2).subs(df1, 0)]]) / 2
+
+    print("A")
+    print(A)
+    print("B")
+    print(B)
+    print("solution")
+    print(A.inv() * B)