It turns out that the Christoffel symbol of second kind found with sympy.diffgeom was invalid. I will try to make a new post here for this soon.
On Saturday, October 24, 2015 at 9:11:28 PM UTC+2, Imran Ali wrote: > > I have made a geodesic solver using sympy.diffgeom and scipy.integrate. > Currently I am having some issue with the solver. But the problem may be > related to Scipy. I have posted a thread here : > > > http://scicomp.stackexchange.com/questions/21103/numerical-solution-of-geodesic-differential-equations-with-python > > Will let you know how it turns out. > > On Monday, October 19, 2015 at 4:31:37 PM UTC+2, Ondřej Čertík wrote: >> >> On Mon, Oct 19, 2015 at 7:59 AM, Imran Ali <[email protected]> wrote: >> > >> > >> > On Saturday, October 17, 2015 at 8:49:28 PM UTC+2, Francesco Bonazzi >> wrote: >> >> >> >> >> >> >> >> On Saturday, 17 October 2015 17:52:38 UTC+2, Imran Ali wrote: >> >>> >> >>> >> >>> But this result does not correspond to the hand calculations of >> Thomas >> >>> Moore : >> >>> >> >> >> >> Do you know that unlike matrices tensors don't have defined >> components? I >> >> mean, you may vary their valence (i.e. raise and lower the indices), >> and >> >> you'll get different components. >> >> >> >> I did not verify it by hand, but I guess that if you raise the first >> index >> >> of Thomas Moore's Riemann tensor, you'll get the output by SymPy. >> > >> > >> > Ah of course! He has calculated the covariant form of the >> > Riemann-Christoffel tensor. >> >> >> Perfect. Does everything work as expected then? >> >> If you find further possible problems, please let us know. >> >> Ondrej >> > -- 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 post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/c54e0494-cb1c-4991-9e39-9bef6f1d4cfb%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
