By the way, what are the differences between sympy.vector and sympy.physics.vector ? Why two different modules?
Davide. Il giorno ven 13 ago 2021 alle ore 15:06 Davide Sandona' < sandona.dav...@gmail.com> ha scritto: > Although the scalars are r, theta and z the unit vectors are i, j and >> k. How would I get vectors like e_r and e_theta to work with those? >> > > As of now, that's not possible. It is hard-coded and it only represents > cartesian unit vectors [1] > > As per the SO question, I don't think SymPy is currently able to do that. > > So far, I found the vector module difficult and not trivial to use. There > was another question about this module a few months ago, about the > difficulty to interact with it. I think we should open a discussion on > Github, collecting examples that don't work and examples that could be > improved (in terms of user experience) in order to improve our > comprehension of what needs to be fixed, eventually preparing the way for a > future GSoC. > > [1] > https://github.com/sympy/sympy/blob/master/sympy/vector/coordsysrect.py#L180 > Davide. > > > Il giorno ven 13 ago 2021 alle ore 14:20 Oscar Benjamin < > oscar.j.benja...@gmail.com> ha scritto: > >> Hi all, >> >> Does anyone know how to use cylindrical polars with SymPy's vector module? >> >> I just saw this SO question here: >> >> https://stackoverflow.com/questions/68767945/how-do-i-work-with-vectors-in-cylindrical-and-spherical-systems-with-sympy >> >> We can define a coordinate system like this: >> >> In [25]: from sympy.vector import CoordSys3D >> ...: >> ...: N = CoordSys3D('N', transformation='cylindrical') >> >> In [26]: N.base_scalars() >> Out[26]: (r_N, theta_N, z_N) >> >> In [27]: N.base_vectors() >> Out[27]: (i_N, j_N, k_N) >> >> Although the scalars are r, theta and z the unit vectors are i, j and >> k. How would I get vectors like e_r and e_theta to work with those? >> >> Oscar >> >> -- >> 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 sympy+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/sympy/CAHVvXxQeGu9q_i5YsCKCrevjSyOMQU49cdzHA2kG2PArXX0%3Dfg%40mail.gmail.com >> . >> > -- 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 sympy+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAO%3D1Z09zAzQ%3DgW%2BWA7MZQj8njtp8sE0aw%2BYn3%2B-fCKK%3Dd0PQkw%40mail.gmail.com.
