PR here: https://github.com/sympy/sympy/pull/20047
On Fri, Aug 28, 2020 at 6:05 AM Faisal Riyaz <[email protected]> wrote: > Hello, > > This looks like a bug. Please do submit a PR. > > Thanks > Faisal Riyaz > > On Thu, Aug 27, 2020 at 4:10 AM Alexander Lindsay < > [email protected]> 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]> 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? >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "sympy" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/sympy/CANFcJrFgKxs1S78dAWKRZeKKbxjHh_OsWWtT%2Btgz3EWW_3F6hw%40mail.gmail.com >> <https://groups.google.com/d/msgid/sympy/CANFcJrFgKxs1S78dAWKRZeKKbxjHh_OsWWtT%2Btgz3EWW_3F6hw%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/CAEe-xqSyp947SY4_2xJm02QJJPPxTDBoVdz2g7w26z83nwOQnw%40mail.gmail.com > <https://groups.google.com/d/msgid/sympy/CAEe-xqSyp947SY4_2xJm02QJJPPxTDBoVdz2g7w26z83nwOQnw%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CANFcJrEhtFn%3DWKConvgFCr04WyeVbSVk9T0roJYQcvum8X4H%2BA%40mail.gmail.com.
