galpy.actionAngle.actionAngleTorus.hessianFreqs¶

actionAngleTorus.hessianFreqs(jr, jphi, jz, **kwargs)[source]¶

Return the Hessian d Omega / d J and frequencies Omega corresponding to a torus

Parameters:

jr (float) – Radial action
jphi (float) – Azimuthal action
jz (float) – Vertical action
tol (float, optional) – Goal for |dJ|/|J| along the torus. Default is object-wide value.
dJ (float, optional) – Action difference when computing derivatives (Hessian or Jacobian). Default is object-wide value.
nosym (bool, optional) – If True, don’t explicitly symmetrize the Hessian (good to check errors). Default is False.

Returns:

Tuple containing: - dO/dJ - Omegar - Omegaphi - Omegaz - Autofit error message

Return type:

tuple

Notes