If you are dealing with gradient you might find this link of interest -
https://galgebra.readthedocs.io/en/latest/module-components.html#differential-operators
the galgebra package is built on top of sympy.
On 8/26/20 6:40 PM, Alexander Lindsay wrote:
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] <mailto:[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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