This patch fixes the bad behavior:
diff --git a/sympy/vector/operators.py b/sympy/vector/operators.py
index 2f303ee690..994894f379 100644
--- a/sympy/vector/operators.py
+++ b/sympy/vector/operators.py
@@ -362,6 +362,4 @@ def _diff_conditional(expr, base_scalar, coeff_1,
coeff_2):
"""
from sympy.vector.functions import express
new_expr = express(expr, base_scalar.system, variables=True)
- if base_scalar in new_expr.atoms(BaseScalar):
- return Derivative(coeff_1 * coeff_2 * new_expr, base_scalar)
- return S.Zero
+ return Derivative(coeff_1 * coeff_2 * new_expr, base_scalar)
Should I submit a PR?
On Wed, Aug 26, 2020 at 3:30 PM Alexander Lindsay <[email protected]>
wrote:
> Execution of the below code:
>
> From sympy.vector import divergence, gradient, Vector, CoordSys3D
> R = CoordSys3D('R', transformation='cylindrical')
> divergence(R.i)
>
> generates a zero result. I believe the result should be 1/r, right?
>
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