Thanks for the reply Ondřej. I will look into Julia's implementation. I think that is a good place to start. I will eventually try to implement a lot more though. I am looking towards a Quaternion Algebra submodule. I found one such module in Sage so I guess that might be a good reference as well.
On Friday, August 4, 2017 at 12:23:38 PM UTC-5, Ondřej Čertík wrote: > > Hi Nikhil, > > On Fri, Aug 4, 2017 at 8:12 AM, Nikhil Pappu <nkhl...@gmail.com > <javascript:>> wrote: > > I was able to find some support for Quaternion Rotation in the Vector > module > > but I did not come across a general submodule on Quaternions which > allows > > users to define them and work with them. > > I would like to implement a submodule which can support Quaternion > > Arithmetic, Functions, Quaternion Calculus, Rotation conversions etc. > > It can then be extended to support more advanced Quaternion Algebra. > > > > Would it be a good idea for me to start working on this? > > > I think that would be useful. I was just looking for such a module few > days ago. You should look into how Julia does it: > > https://github.com/JuliaGeometry/Quaternions.jl > > Looks like they represent a quaternion a+bi+cj+dk as a tuple of of > coefficients (a, b, c, d) and they also store a flag if the norm can > be computed (it seems). > > Here I wrote code to multiply quaternions: > > > https://gitlab.com/certik/ijk/blob/df5f961d1f0432449fd7f16d21fa14840eef8c72/mul.py > > > I used complex 2x2 matrices. But Julia simply computes the new > coefficients (a, b, c, d) directly: > > > https://github.com/JuliaGeometry/Quaternions.jl/blob/62200f0ac5efd6d4d042f5d778d0cf2856c38c50/src/Quaternion.jl#L88 > > > That's probably the way to go. > > 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 sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at https://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/f0b5dcbe-6a3c-4d36-8e0c-e6f7c9de2d1d%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
