pub fn polar_translation(
order: i32,
args: [Complex; 4],
radial: Radial,
) -> Result<Complex>Expand description
Cylindrical translation in (k_rho*rho, phi, z, kz) with a fixed order difference,
the kernel of tl_vcw. The two axial labels must move together; unequal labels are
uncoupled.
Upstream: treams.special.tl_vcw and tl_vcw_r at equal axial wavenumbers, with
order = m - mu.