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The Wigner symbols and Clebsch Gordan coefficients can be found at two places:
http://docs.sympy.org/latest/modules/physics/quantum/cg.html
http://docs.sympy.org/dev/modules/physics/wigner.html
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When the quantum numbers become large, the relative sizes of the Wigner symbols can span tens of orders of magnitude. This frequently leads to overflow in the recurrence relations, which we deal with …
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wigner_3j appears to give non-zero values for Wigner 3j symbols that have invalid (non-physical) arguments. For example, wigner_3j(0.5,0.0,0.5,0.0,0.0,0.0) evaluates to sqrt(2)/2 when in fact these ar…
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Mike Boyle (@moble) has taken great care in the package [`spherical`](https://github.com/moble/spherical) to make sure that Wigner 3j symbols can be evaluated without using factorials, to avoid overfl…
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zeroj line 68:
```
error('Insufficient bandwidth for database')
% HERE WE SHOULD RUN WIGNERCYCLE
```
Need to make it automatically run wignercycle to improve ease of use. Or at lease print out a…
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I'm using SOAPFAST/[TENSOAP](https://github.com/dilkins/TENSOAP) as a reference, since it's the code underlying all SA-GPR publications so far. When I compare the spherical covariants (a.k.a. power sp…
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Although there are already some ideas in #3, we should have more fine-grained discussion on the content of QuBase. Maybe we can use this issue to collect some ideas and refine the roadmap in #3.
The …
acroy updated
6 years ago
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Have you thought about using ```jax.numpy``` instead of ```numpy```? I am using ```py3nj``` for my research and now I am porting the code to JAX. Do you think that the way the code is written would be…
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Hi all,
When trying to run FASTPT, I got this error with the following codes:
fpt=FASTPT(k_emu,to_do=['all'],low_extrap=-5,high_extrap=3,n_pad=int(0.5*len(k_emu)))
AttributeError …
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We want to do scattering of three pions, starting with maximal isospin-3-component to have the simplest of these cases. This projection code here seems to be limited to I=1 I₃=1 and L=1. Perhaps I₃ is…