Return the classic name for noll’s index n or "-" (no name defined) without warning if n > 21.
Examples:
zernike_name(4) ⇒ defocus zernike_name(21) ⇒ vertical pentafoil
See also: zernike_cartesian, zernike_noll_to_nm, zernike_polar, zernike_R_poly.
Package: optics