kernel#
jeanspy.model_jax.ConstantAnisotropyModel.kernel
Class and construction: ConstantAnisotropyModel.
- ConstantAnisotropyModel.kernel(u, R_pc, *, params, kernel_backend='jax', n_kernel=None)[source]#
LOSVD kernel K(u) for constant anisotropy.
Uses the transformed hypergeometric representation
K(u) = sqrt(1-u^{-2}) * ((3/2-beta) * 2F1(1,beta;3/2;1-u^{-2}) - 1/2)
which is algebraically equivalent to the original form in model.py and numerically stable for large u.
- Parameters:
u (jax.Array) – Dimensionless radius ratio u=r/R (typically u>1).
R_pc (jax.Array) – Accepted by the shared anisotropy interface; K(u) is independent of R.
kernel_backend (str) –
'jax'uses the direct JAX quadrature kernel.'scipy'uses the SciPy hypergeometric formulation.n_kernel (int | None) – Quadrature order for the direct JAX kernel implementation.
- Return type: